Answer:for filter feeding
Explanation:setae are used by filter feeders such as small crustaceans,baleen whales and marine prions.these organisms feed on suspended Feed in waters and so need a structure that allows them to extract the suspended particles from the water
The combination of mitotic cyclin with CDK signals the __________.
Question 17 options:
beginning of cell mitosis.
completion of cytokinesis.
growth of a cancer cell.
start of the cell cycle.
｡☆✼★ ━━━━━━━━━━━━━━ ☾
The correct option would be D. start of the cell cycle.
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Answer:
Your answer: start of the cell cycle.
Explanation:
Please mark brainliest! Hope it helped!
Which of the following aids in the weathering and transportation of rocks?
Question:
Which of the following aids in the weathering and transportation of rocks?
A. wind
B. clouds
C. sunlight
D. all of these
Answer:
Winds aids in the weathering and transportation of rocks
Explanation:
Weathering is process of break down of the rocks, and then it gets dissolved into small pieces by the means of physical, physiological, chemical or also biological process. Transport of these particles helps in the completion of the process, this leads to the movement of the materials from one place to another. Basically the erosion takes place by, water wind and ice. Hence two types of weathering have been reported like mechanical and chemical.
Which pair of statements best describes an essential amino acid?
It is an amino acid that contains peptide bonds. An example is proline.
It is an amino acid that contains nitrogen. An example is aspartic acid.
It is an amino acid that cannot be made by the body. It must be obtained from eating certain foods.
It is an amino acid that can be produced by the body. Vitamin supplements maintain healthy levels
Answer:
C
Explanation:
It is an amino acid that cannot be produced by the body. It must be obtained from eating certain foods.
1 If the molecules in a gas lose energy, they will —
A collide more frequently and slowly condense into a liquid.
B move closer together and change phase into a liquid
C start to bond together and change phase into a solid
D collide less frequently and slowly sublimate into a solid
If the molecules in a gas lose energy, they will move closer together and change phase into a liquid
Explanation:
Condensation is process where matter changes his states from one to another. In evaporation, matter changes from liquid to gas but when matter changes from gas to liquid is known as condensation. It exists in the form of heat.
The example of condensation of water drops outside the glass. It happens when molecule become cool. Here molecule lose heat. Here it loses its temperature or heat and become slow down
*Can someone help me. Don't know how to solve *
A group of scientists studying vegetation in a mountain range observe that a certain flowering plant grows taller at lower elevations and shorter at higher elevations. Assuming the two populations of plants are genetically similar, those height variations are most likely due to developmental flexibility that allows the plants to assume tall or short growth forms.
(a) Identify THREE biotic or abiotic factors that could differ at high and low elevations and cause the difference in plant height.
(b) Using one of the factors listed in part (a) as an independent variable, write a hypothesis that proposes how this variable could cause the difference in plant height at high and low elevations.
(c) You are given seeds for this species of plant. Design a procedure for a controlled experiment to test your hypothesis.
(d) Describe the results that would support your proposed hypothesis, and the results that would refute your hypothesis.
Hi
Before answering the question, we need to understand the fact that there are some abiotic and biotic factors which affect the growth and development of plants, for example sunlight, wind, heat, presence of certain beneficial insects, bacteria etc. Although the height of plant is determined by its genetics mainly, however the effects of external factors cannot be ignored since they highly affect a plant's development.
Q 1( (a) Identify THREE Biotic or Abiotic factors that could differ at high and low elevations and cause the difference in plant height
In this question, we are asked about two plants of same specie which grow with different heights at low and high elevations. If we think about the abiotic factors of mountain, we know that thee are certain factors which differ at low and high elevation). These are:
1: Concentration of Oxygen: Oxygen is low in concentration at high elevations and high in concentration in low areas. As we know oxygen is important for plant growth and development, therefore, oxygen a plenty of oxygen in lower elevations help plant to gain good and genetically pre-determined height.
2: Temperature: Temperature varies greatly at high and low elevations, In high elevated areas the temperature is lesser as compared to low elevations. Just like oxygen, temperature is also a key factor that controls the development of plant, a good temperature helps the plant to reach its genetically predetermined height.
3: Water: In hilly regions, water do not accumulate at the mountain tops and runs down from top to the bottom elevations of the hills, therefore more water is accumulated in lower elevations as compared to high elevated regions. Just like oxygen, water is also a key factor that controls the development of plant, a good amount of water helps the plant to reach its genetically predetermined height and therefore, plants in region of lower elevations grow taller because the regions receive more water.
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2: (b) Using one of the factors listed in part (a) as an independent variable, write a hypothesis that proposes how this variable could cause the difference in plant height at high and low elevations.
If we talk about Independent variables, these are the factors that are varied or changed in an experiment as per our wish because we want to see the effect of this change on dependent variable (the other one that is being studied). We select Independent variable as water here and dependent variable as Plant height that is affected by change in water concentration. Now we propose the hypothesis:
Hypothesis: The more water concentrations can enhance the height of a plant as compared to a plant given lower quantities of water.
----------------------------------------------------------------------
3: (c) You are given seeds for this species of plant. Design a procedure for a controlled experiment to test your hypothesis.
Now we take water as an independent variable and grow the plant seeds in green house in same pots, same temperature, same light intensity but only difference is the concentrations or quantities of water we give them daily. This will tell us, whether change in water quantities change the heights of plants or not. This sort of experiment is called a controlled experiment in which some factors are altered and others remain same.
----------------------------------------------------------------------
4: (d) Describe the results that would support your proposed hypothesis, and the results that would refute your hypothesis.
Positive results: Suppose that we see a clear difference i heights of the plants grown with lower quantities of water (They are short) and higher quantities of water (They are tall). This is a positive and significant result which tells us that actually water is the factor which is responsible for altered plant heights at lower and higher elevations respectively.
Negative results: On the other hand, If height of both plant groups (grown in different water quantities) is same, it means that there is no remarkable difference between the plant heights and water is not a controlling factor, which refutes our hypothesis.
Hope it helps!
Answer:
A. Three biotic/abiotic factors responsible for plant height
Temperature (abiotic)Moisture content / water (abiotic)Wind / air pressure (abiotic)Microbial activities in the soil (biotic)Justification:
- At higher elevations, low temperature reduces the plant growth significantly. Further, it has been well-established that temperature significantly impacts the expression of genes. In the presence of a cooler atmosphere, the plant height is expected to decrease.
- The availability of water at the top of the mountain is lesser because most of the water will flow down the hill. Therefore, it will affect the water content in the soil, thus affecting nutrients availability and soil quality parameters as well (total organic carbon, microbial activities, etc.). On the other hand, at lower elevations, there will be more water available for plant growth and nutrients bioavailability.
- At higher elevations, the wind/air pressure would be high compared to the lower elevations. Thus, the plants at higher elevations will often fall down and only smaller height plants will survive better.
- Biogeochemical transformation or high turn over of the soil ingredients is better expected at lower elevations due to the combined action of all of the abovementioned conditions. Briefly, microbial activities will be fast in the presence of high temperature, high moisture content and low wind pressure. The food will be abundantly available for microbes and their high turn over will increase the soil quality. This will ultimately impact the growth of the plants.
-----------
B. Hypothesis to test: Increasing the temperature of the soil obtained from elevations would improve the microbial activities thus supporting the bioavailability of nutrients, which are necessary for the plant growth (N, P, K).
N=Nitrogen, P=Phosphorus, K=Potassium
-----------
C. Soil will be obtained from the top of mountains (high elevations) for plant growth study. The changes in topsoil would improve plant growth in the presence of nutrients. Different treatments could be
Control #1: Plants growing in the soil incubated at a lower temperature (4°C).Control #2: Plants growing in the soil incubated at a higher temperatures (30°C).Treatment #1: Plants growing in the soil at lower temperature in the presence of nutrients (N, P, K)Treatment #2: Plants growing in the soil at high temperature in the presence of nutrients (N, P, K).------------
D. Expected results:
Improving temperatures for soil obtained from higher elevations would improve biological activities. The nutrients (N, P, K) bioavailability will be increased and the growth of plants would be improved. Also, the relative proportion of total microbial counts (tested via 16S sequencing) will be high after improvement in temperature. Thus, the study would support that temperature is a crucial and driving factor for plant growth, which indirectly affects the microbial biogeochemical cycles and affect the soil quality.
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Which actions can humans take to reduce wave erosion? Select two options.
A. build drainage systems
B. build houses near coastlines
C. build breakwaters in the ocean
D. reduce vegetation along coastlines
E. reduce effects of global warming
Answer: C and E
Hope this helps!!
Answer:
c and e
Explanation:
Which activities are included in the management of water resources? Check all that apply. planning how to transport water using technology to purify water studying the composition of water building structures to store water determining the selling price of water.
A, B, D on edge
Answer:
Planning how to transport water; using technology to purify water; building structures to store water.
Explanation:
Water source management is a set of actions to regulate and control the use and protect these vital sources. Management must be done in accordance with current legislation and in order to preserve the quantity and quality of water. The management of water resources aims to ensure the availability and quality of water for its various uses, including public supply and preservation of the environment.
For this, they require several actions such as preservation and restoration of riparian forests, preservation of springs, techniques of management of agricultural soils and pastures, implementation of collecting networks and sewage treatment plants, collection and treatment of urban waste and industrial effluents, among others. many others. Other actions like planning how to transport water (to avoid contamination of the water), using technology to purify water, to make it possible to renovate the source, building structures to store water to avoid contammination.
Answer:
A planning how to transport water
B using technology to purify water
D building structures to store water
Explanation:
Why would you expect the crystals in an intrusive rock to be larger than the crystals in an
extrusive rock?
A. The crystals in intrusive and extrusive
rocks are generally the same size.
B. Intrusive rocks cool more rapidly, which
produces larger crystals.
C. Intrusive rocks cool more slowly, which
produces larger crystals.
D. The chemical composition of intrusive
rocks produces large crystals.
Answer:
C. Intrusive rocks cool more slowly, which produces larger crystals
Explanation:
Intrusive rocks are igneous rocks that form beneath the surface. Unlike extrusive rocks (rocks that form above the surface), intrusive rocks cool down more slowly, so this allows crystals more time to grow before they completely cool down and solidify.
The crystals in intrusive rocks are larger than the crystals in extrusive rocks because intrusive rocks cool more slowly.
Explanation:When comparing intrusive rocks to extrusive rocks, you would expect the crystals in intrusive rocks to be larger. This is because intrusive rocks cool more slowly compared to extrusive rocks. The slower cooling rate allows for more time for the crystals to grow, resulting in larger crystal grains in the rock.
what is a example of the way matter cycles through the body of living things
Answer:
the correct anwser is whales eating plankton
Explanation:
a pex
a black rooster mates with a white hen. Based on their genotypes, the chance that the offspring will be checkered is 100 percent. What is the roosters genotype? what is the hens genotype?
Answer:
Rooster: BB Hen: WW
Explanation:
Let's assign B for Black and W for White.
The scenario states that the chance that the offspring will be checkered is 100%. This means that both black and white are expressed at the same time. This phenomenon is called INCOMPLETE DOMINANCE. This happens when one of the alleles do not completelt mask the other, so instead of getting the trait of one of the parents, a new type of phenotype is formed.
The only way for the offsprings to ALL turn out checkered is if the parents were homozygous for their specific traits. So look at the Punnet below:
W W
B BW BW
B BW BW
Both are homozygous dominant because if either of the color were recessive, it would be masked.
Answer:
BB,WW
Explanation:
Susan makes a claim that humans do not evolve because we adapt to situations by changing our technology, not ourselves. Which piece of evidence contradicts this idea?
Humans have been tool users for a long time.
Other primates use tools.
The size of our brains has increased since we became tools users.
Our technology is always increasing
Answer:
The size of our brains has increased since we became tools users.
Answer:
c
Explanation:
which of the following show how mining for materials used in smart devices impacts the environment select three
-increases child labor
-grows the economy
-degrades vegetation
-creates competition for water
-increases soil erosion
its obviously not child labor or economy based because those have nothing to do with the environment so its the other three.
Answer:
-degrades vegetation
-increases soil erosion
-creates competition for water
Explanation:
There are many environmental impacts caused by mining, economic and industrial activity that consists in the research, exploration, extraction and processing of ores present in underground deposits. The same is true of mining for materials used in smart devices. This human activity destroys nature and creates very damaging ecological imbalances that diminishes the quality of life not only for humans but for all living beings.
Mining causes pollution of water resources by decreasing the amount of drinking water and increasing competition for water in some places. In addition, it causes soil degradation through erosion and causes loss of diversity by degrading vegetation and animal life.
Which population is most likely to have exponential growth?
O
A. The mold growing in a moist bathroom that is never cleaned
O
B. The seals living in a harbor with limited rocks and fish
O
c. The fish living in a pond where many humans fish
O
D. The vegetables growing in a garden that is frequented by many
rabbits
Answer:
The most likely exponential growth is The mold growing in a moist bathroom that is never cleaned
Explanation:
Exponential growth happens due to increase in number as well as in size of individual per unit time. Exponential growth also seen to be supporting the reproduction cycle and larger pool of individuals for the coming cycle. It is also being affected with the availability of food and predation, these two factor can become threat to mold growth. The food availability is ought to be limiting factor for growth of mold. Here, the growth of molds in moist condition as well as when the bathroom is never cleaned, it simply means the ample amount of food availability for growth of molds. Therefore this example supports the exponential growth.
The population that is most likely to have exponential growth is the mold growing in a moist bathroom that is never cleaned. This is due to the conducive environment that offers a continuous supply of resources and lacks limitations for reproduction and growth.
Explanation:The population most likely to have exponential growth is the mold growing in a moist bathroom that is never cleaned (Option A). Exponential growth occurs when the growth rate of a biological population is proportional to the size of the population. In a favorable environment with abundant resources and minimal limitations, the population can grow continuously, leading to a J-shaped growth curve, typical of exponential growth. For instance, mold in a consistently moist and unclean bathroom would have ample food and space, allowing a breeding ground for fast reproduction and growth, resulting in exponential increase. In contrast, other options involve nutrient competition, predation, or other limiting factors preventing exponential growth.
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is penecillin a bacterium
true
false
Answer:
false
Explanation:
Penicillin prevents peptidoglycan from cross-linking properly in the last stages of bacterial cell wall synthesis. This greatly weakens the cell wall and causes the bacterium to lyse, or burst open, because of osmotic pressure. Penicillin is bactericidal because it directly kills bacteria.
Ethics is an important area of biotechnology. Why can ethical standards vary?
People may have different ideas of what is right or not.
Ethics depend on state laws.
One person has to decide what is ethical for everyone.
Ethics do not apply to most sciences.
Answer:
A
Explanation:
People may have different ideas of what is right or not.
Ethics is an important area of biotechnology. The ethical standards vary because people may have different ideas of what is right or not. The correct option is A.
What are Ethics?Ethics is a branch of philosophy. It deals with the concept of right and wrong. What is good behavior and what is bad behavior is told by ethics. It also contains the regulation of life and living a good life.
In biotechnology, there are many things that work for mankind. This branch increases the facilities for life and decreases the rate of diseases. Ethics is important in the field of biotechnology because people may want to do such things that can harm humanity.
So with ethics, only such things are discovered that are good or humanity, and that increase the chances of peace and survival in humans.
Thus, the correct option is A. People may have different ideas of what is right or not.
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Which equation represents a fission reaction?
14N+H—150
o se ut n— 1 CS + S Rb +2n
o Be + He — C +ón
28 Np — 23 Pute
Mark this and return
Answer:
Option B is correct: 235 92U + 1 0n→ 140 55Cs + 94 37Rb + 2 (1 0n)
Explanation:
During nuclear fission, nucleus of an atom splits into smaller parts. The fission process produces free neutrons and photons, and releases a large amount of energy.
In these four reactions, only B option satisfied the conditions of a nuclear fission reaction. Here is more detail
B. 235 92U + 1 0n → 140 55Cs + 94 37Rb + 2 (1 0n)
235 92U atoms split into 140 55Cs and 94 37Rb smaller parts with the help of neutron (energy).
The other three reactions are the example of nuclear transmutation reactions.
A. 14 7N + 1 1H → 15 8O
C. 9 4Be + 4 2He → 12 6C + 1 0n
D. 239 93Np + 239 94Pu + 0 -1e
10 POINTS!!
If the communities in Figure 5-1 were put in order of least to most biological diversity, they would be ____.
Answer:
BDAC
Explanation:
Genetic engineering can be used to create more productive strains of farm animals. By adding genes to an animal’s DNA, the animal can be made to produce milk or meat containing vital nutrients that would not be found naturally in those products. This provides a greater amount of nutrients per serving of milk or meat. What are some possible impacts (positive and negative) of this type of genetic engineering on individuals, society, and the environment?
Answer:
The field of genetic engineering has remained controversial ever since its existence. Some scientists extremely favour the recombinant DNA technology whereas others consider it to be dangerous.
Some of the positive impacts would be that these animals would provide better milk quality and quantity. The meat of these animals will be able to provide better nutrition. Hence, in this way these animals will help to fight malnutrition.
The negative impacts of such animals would be that one never knows that if a mutation occurs in these organism than how dangerous it could be for the world. There is also a threat that the genetically engineered animals if mated with the wild life can cause threats. It might also lead to the wild- life of animals being extinct.
How do beach nourishment and vegetation management differ in the ways they manage beach erosion?
Only beach nourishment uses a hard structure to manage erosion.
Only vegetation management replaces sand on the beach.
Only vegetation management brings in plants to keep sand on beaches.
Only beach nourishment provides protection from floods.
Beach nourishment involves replacing sand on beaches to combat erosion, while vegetation management focuses on planting native vegetation to stabilize the sand. Both aim to protect against erosion but have different methodologies and impacts, with nourishment sometimes leading to ecological issues if not conducted responsibly.
Explanation:Beach nourishment and vegetation management are both strategies to combat beach erosion, but they operate in different ways. Beach nourishment involves the addition of sand or sediment to a beach to combat erosion by replenishing the beach system. It does not typically use hard structures, contrary to breakwaters or sea walls; these are different methods known as 'hard engineering' techniques. Instead, beach nourishment provides a softer approach with the added sand acting as a buffer to wave energy.
In contrast, vegetation management attempts to stabilize the sand by planting native vegetation. These plants help in holding the soil together with their root systems and provide protection against erosive forces such as wind and water. It is essential to understand that vegetation management does not directly replace sand; rather, it helps to prevent its loss over time.
Beach nourishment might provide incidental protection from floods by bolstering the beach's width and height, thus acting as a barrier to storm surges; however, this is not its primary purpose. Vegetation management can also help in this regard by stabilizing the soil and reducing the potential for erosion during storm events.
It is important to recognize that while both methods aim to protect against erosion, they must be applied thoughtfully. Dredging, which is sometimes associated with beach nourishment, can cause significant ecological damage, as seen in the degradation of reefs, sea grass beds, and the loss of marine life, consequently affecting local economies reliant on fisheries and tourism.
Final answer:
Beach nourishment involves adding sand to replenish eroded areas, while vegetation management focuses on planting and maintaining vegetation along the beach to stabilize sand and prevent erosion. Beach nourishment uses hard structures, while vegetation management does not.
Explanation:
Beach nourishment and vegetation management are two different methods used to manage beach erosion. Beach nourishment involves adding sand or sediment to the beach to replenish eroded areas. This is typically done using large-scale dredging and pumping operations. On the other hand, vegetation management focuses on planting and maintaining vegetation along the beach to stabilize sand and prevent erosion. This can include using beach grass, shrubs, and trees to trap and hold sand, as well as creating natural barriers against wave action. Unlike beach nourishment, vegetation management does not involve the use of hard structures such as seawalls or groins.
Which is not found in a nucleotide
Answer:
Phospholipids
Explanation:
A nucleotide does not contain phospholipids. Phospholipids are molecules that make up the cell membrane and nuclear envelope
Why do animals have different structures that perform similar functions (e.g. gills and
lungs)?
Final answer:
Animals have different structures that perform similar functions due to convergent evolution, such as gills and lungs. Convergent evolution occurs when unrelated organisms adapt to similar environmental conditions and develop analogous structures.
Explanation:
Animals have different structures that perform similar functions due to the process of convergent evolution. Convergent evolution occurs when unrelated organisms adapt to similar environmental conditions and evolve similar structures to carry out the same function. These structures are called analogous structures. For example, gills in fish and lungs in mammals are both respiratory organs that allow for the exchange of oxygen and carbon dioxide, but they evolved independently in these two groups of animals.
Which of the following would be a result of eutrophication of nitrogen
Which of the following would be a result of eutrophication of nitrogen?
-undergrowth of water plants
-hypoxia, or low levels of oxygen
-Decreased decomposition
-inactivity of fertilizers
Answer:
Eutrophication results from the increased amount of fertilizers in local water bodies like ponds or lakes. This actually results in the hypoxia or decreased oxygen content of the water bodies.
Option B
Explanation:Eutrophication is seen in the water bodies that are located beside the agricultural fields. This actually occurs when rain water or water from different sources come into the water bodies. This leads to huge outgrowth of water weeds and this actually decreases oxygen content of water in two ways. Firstly, they consume a lot of oxygen dissolved in water. Secondly they block the sunlight entering inside water, thereby preventing photosynthesis from aquatic plants. Thus, the hypoxia exists in water which kills the aquatic animals like fishes etc. This condition can be prevented by application of several other ways like removing the weeds and purifying the water of the ponds etc. Else this will contaminate the whole environment.
Which is true about enzymes?
Question 10 options:
They act on nonspecific, randomly chosen substrates.
After a reaction, they cannot be reused.
They can speed up metabolic processes in the body.
They cannot change shape.
PLEASE DO NOT GUESS I REALLY NEED TO GET THIS RIGHT! <3
Answer:
They can speed up metabolic processes in the body
Explanation:
Enzymes are specific in action
They are protein in nature
Final answer:
Enzymes are specific catalysts that speed up metabolic processes by lowering activation energy and can be reused after reactions; they also change shape for substrate binding.
Explanation:
The true statement about enzymes is that they can speed up metabolic processes in the body. Enzymes achieve this by acting as biological catalysts that lower the activation energy of reactions. They are highly specific and do not act on nonspecific, randomly chosen substrates. Contrary to being single-use, after a reaction enzymes can be reused as they are not consumed in the reactions they catalyze. Lastly, enzymes can and do often change shape, undergoing conformational changes upon substrate binding based on the induced fit model.
Which of the following statements best explains the. Effect of combustion from manufacturing
Answer:
disease , to effect agriculture
Explanation:
to control the acid in the industry
Answer:
See Explanations for answer
Explanation:
The social studies practice tests provide teachers and students with items that mirror the kinds of questions that
appear on the LEAP 2025 Social Studies assessments. To illustrate how the assessment reflects the Department’s
vision for social studies and to support teachers in their use of the practice tests, this document contains a sample of
annotated items from the LEAP 2025 Social Studies Practice Tests for grades 3-8. The annotations describe the
purpose and reasoning represented in the selected items. For additional information about the practice tests, please
see the LEAP 2025 Social Studies Practice Test Guidance.
Grade 3
Grade 4
Grade 5
Grade 6
Grade 7
Grade 8
SOCIAL STUDIES VISION
To be productive members of society, students must be critical consumers of the information they read, hear, and
observe. To develop and express informed opinions, they need to examine and evaluate information from an array of
sources and connect that information with their background knowledge. To understand how events happen and why
people act in certain ways, students must also make connections between what happened in the past and what is
occurring in the present. To accomplish this, students must
use sources regularly to learn content;
make claims that demonstrate connections among people, events, and ideas across time and place; and;
express informed opinions using evidence from sources and outside knowledge.
Simply stated, students must delve deeply into content so that they are able to develop and support claims about
social studies concepts.
Help pls i mark as brainlist answer all 4
What is the leaf of a plants function ?
Answer: photosynthesis
Explanation: leaves are a very important part of the plant. plants are autotrophic in nature. They can synthesize their own food. Leaves have green color pigment in it which is called chlorophyll. This chemical compound chlorophyll uses light energy from the sun and converts water and carbon dioxide into sugars. By this method, plants prepare their own food.
Answer:it produces food
Explanation:
Photosynthesis
An organism that makes its own food is called a
An autotroph is an organism that can produce its own food. An example would be plants because they use sunlight, air, and water to make their own food which is the process defined as photosynthesis. This is the process where plants soak up the water through the roots. Also, some bacteria produce their own food to live as well. It's important to understand that photosynthesis is not the only way that organisms can produce their own food. They can also produce their own food by something called chemosynthesis.
Read the article and use the information to answer the questions that follow. Discovering the Structure of DNA Explain how the discoveries by Rosalind Franklin helped Watson and Crick build an accurate model of DNA.
Discovery of structure of DNA by Franklin and Watson and Crick.
Explanation:
Rosalind Franklin was researching about DNA structure at the King’s College at London based on x-ray diffraction studies; while, Crick and Watson were researching on the same at the Cambridge University based on Linus Pauling discovery of proteins.
Once when Watson happen to listen to Franklin’s lecture upon DNA structure and how it depends on relative humidity of the air and other facts relating to DNA; he along with Crick made physical DNA models which became a big failure.
Later, Franklin found that a wet form of DNA with high humidity had a helix like structure. This point became the base of later discovery of Watson and Crick’s double helix model of DNA along with the discovery of DNA molecules being made up of double chain of nucleotides.
Rosalind Franklin was a chemist, who discovered X-ray diffraction and a key role in determining the structure of the DNA molecule.
The discoveries of Franklin and Watson and Crick on DNA are:
Franklin used the X-ray crystallography technique to identify the double-helical structure of the DNA. Watson and Crick's foundation was laid on the discovery of Franklin's DNA structure. Watson and Crick suggested that bases are joined together to their complementary bases, which gives DNA its helical structure.
Thus, Watson and Crick used the information given by Franklin to discover the properties of DNA.
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Which of the following sources of pollution decrease the oxygen level of water? Select the two correct answers
A) toxic metals
B) radioactive substances
C) plant fertilizer
D) animal manure
E) gasoline
Answer:
The source of pollution that decreases the oxygen level of water are plant fertilizer and animal manure.
Explanation:
Plant fertilizer that is applied in the agricultural field when enter into the water body, causes water pollution which increases minerals into the water body and animal manure contain raw material which causes eutropication that means increase algal bloom. This indirectly decreases oxygen availability into the water body.
Plant fertilizer and animal manure are the sources of pollution which decrease the oxygen level of water.
What is Pollution?This is the introduction of contaminants or foreign bodies into the environment.
Plant fertilizer and animal manure leads to eutrophication and algal bloom as a result of the minerals present thereby decreasing the oxygen level.
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Please I need the answer ASAP
The correct evidence statements for explaining the relationship among carbon, amino acids, and proteins are:
b. Proteins are polymers made up of amino acids.
d. Amino acids are monomers made up mostly of carbon, hydrogen, nitrogen, and oxygen.
Here's why these statements are correct:
b. This statement accurately describes the fundamental relationship: amino acids are the building blocks of proteins. Proteins are formed by linking numerous amino acids together in chains through peptide bonds.
d. This statement highlights the composition of amino acids, which are indeed organic molecules primarily composed of carbon, hydrogen, nitrogen, and oxygen. This foundation in carbon establishes the connection between amino acids and the element itself.
Incorrect statements:
a. This statement reverses the relationship. Amino acids are the monomers, not the polymers.
c. While both proteins and amino acids contain carbon atoms, this statement alone doesn't explain the specific relationship between them. Many other molecules also contain carbon but aren't related to protein and amino acid composition.
Therefore, only statements b and d provide relevant and accurate evidence for explaining the connection between carbon, amino acids, and proteins.