B. similar mutations
Final answer:
Species can have similar features or behaviors if they face similar environmental pressures leading to convergent evolution or if they have a common evolutionary history indicated by homologous structures. Analogous structures can also occur when species evolve independently to have similar adaptations.
Explanation:
Two different species may have similar features or behaviors due to the convergence of form in organisms that share similar environments, a concept known as convergent evolution. For example, the arctic fox and ptarmigan both have seasonal white phenotypes to blend with the snow and ice. This occurs not due to a common ancestry, but because of similar environmental pressures that offer advantages such as camouflage from predators.
Another reason for similarities might be due to homologous structures, which are features that are similar in form and genetic makeup and indicate a close evolutionary relationship. An example of homologous structures is the similarity in bone structure of bat and bird wings. However, when similarities occur between species that aren't closely related, due to adapting to similar environmental challenges rather than common ancestry, these are referred to as analogous structures or homoplasy. Insect wings vs. bird and bat wings are an example of such analogous structures.
What determines an organism's phenotype?
A.age
B.genotype
C.random mutations
Answer:
B. genotype
Explanation:
Genotype determines an organism's phenotype.
Genotype determines an organism's phenotype.
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How do herbicide-resistant plants help farmers?
A.farmers can spray for weeds without killing the crops
B.the plants kill the weeds
C.the soil is enriched for future plantings
Herbicide-resistant plants allow farmers to control weeds without harming crops, improving crop yield with reduced chemical use. Thus, the correct answer is A
Herbicide-resistant plants help farmers by:
Allowing farmers to spray for weeds without killing the crops, as the plants can survive the herbicides.Reducing the number of chemicals needed during a growing season, leading to improved weed management and increased crop yield.Enabling the use of reduced-risk herbicides that break down more quickly in soil and are non-toxic to wildlife and humans.Choose the molecule that is described by each phrase. energy used during long activities:
Answer:
Lipids.
Explanation:
Lipids are for longterm energy. Commonly confused with carbohydrates but carbs are short term.
Answer:
This energy comes from fats, specifically lipids.
Explanation:
Lipids are fat molecules that, in the organism of living beings, perform a series of biological functions, mainly the long-term storage of energy.
One of its characteristics is that they are easily stored by the body, but they are difficult to consume. This explains why foods rich in lipids are usually the ones that contribute the most to those unwanted fats!
In fact, when ingested in excess, they are stored in adipose tissue. The organism normally only starts to consume these molecules when there is a deprivation of other energy sources.
how is mitosis different in plants and animals?
A. In animals, the cell membrane pinches together.
B. In plants,the DNA is one circular chromosomes.
C. In plants, there are no sister chromatids.
D. In animals, a new cell wall forms.
In animals during mitosis, the cell membrane pinches together.
How is mitosis different in plants and animals?One cell divides into two identical daughter cells during the process of mitosis. In the two cells, the chromosomes are distributed equally. Mitosis increases the number of cells in the body that are employed for growth, repair, and regeneration since the number of chromosomes in the daughter cells is the same as in the parent cell. The process of cytokinesis is used to divide the cells after mitosis.Because of how cytokinesis occurs in plant and animal cells, mitosis differs between the two. While cytokinesis in plants occurs through the construction of a cell wall, it occurs in mammals through the creation of a furrow in the plasma membrane.learn more about mitosis here:
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When you get a mosquito bite or bump your head, What causes the accumulation of fluids in tissues and how does this fluid become lymph?
Answer:
by scratching the bite or bump it causes heat and makes it swell with fluid and sometimes will bleed
The usefulness of microvilli to cells that have them is ___________________.
A.
to aid in their locomotion
B.
to help concentrate food particles
C.
for intracellular trafficking of molecules
D.
to increase their surface area
E.
None of the above
Answer:
D. to increase their surface area
Explanation:
The usefulness of microvilli to cells that have them is TO INCREASE THEIR SURFACE AREA.
Final answer:
Microvilli are essential for increasing the surface area of absorptive cells in the small intestine, enhancing nutrient absorption.
Explanation:
Micovilli are small projections found on absorptive cells that increase surface area and aid in the absorption of nutrients. For example, absorptive cells in the small intestine utilize microvilli to enhance their capability to absorb food efficiently.
The usefulness of microvilli to cells that have them is to increase their surface area. This increase in surface area is particularly important in the absorptive cells that line the small intestine, where it aids in the efficient absorption of food nutrients. Microvilli contribute to the digestion process by enlarging the surface over which nutrients can be absorbed, thus playing a critical role in ensuring that the body receives the necessary nutrients from the food we consume.
Which of the following macromolecules are correctly matched with one of their functions?
Nucleic acids—insulate; carbohydrates—catalyze chemical reactions
Nucleic acids—catalyze chemical reactions; carbohydrates—insulate
Fats—insulate; proteins—catalyze chemical reactions
Fats—catalyze chemical reactions; proteins—insulate
Answer:
The correct option is this: FATS INSULATE; PROTEINS CATALYZE CHEMICAL REACTIONS
Explanation:
The macro molecules that are peculiar to living organisms are carbohydrate, proteins and fat and oil. Each of these macro molecules has its specific functions, which it carries out. For instance, fat is responsible for insulating the body and keeping the body warm. This helps the body to maintain its optimum temperature of 37 degree Celsius.
Proteins are another type of macro molecules. Proteins perform diverse functions in the living organisms, one of these is catalysis of biochemical reaction. Proteins act as catalysts for biochemical reaction by speeding up the rate at which biochemical reaction occur.
The first heart sound is made by...
A) blood moving to the atria
B) blood moving to the ventricles
C) opening of the valve between the atria and the ventricles
D) closing of the valve between the atria and the ventricles
The first heart sound, known as 'lub', is caused by the closure of the atrioventricular valves to prevent backflow of blood after the atria contracted to push blood into the ventricles. Therefore, the correct option is D.
Explanation:The first heart sound, often referred to as 'lub', is caused by the closing of the valve between the atria and the ventricles. During the first phase of the cardiac cycle, the atria contract and push blood into the ventricles. After this, the valves close to prevent the backflow of blood which causes the first heart sound. This means that option D is the correct answer to your question.
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Which correctly identifies the location of the asteroid belt?
Question 1 options:
A
B
C
Answer:
the correct choice is B
located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets.
Answer: B.
Explanation:
The Main asteroid belt in our Solar System is located between the orbits of Mars and Jupiter, therefore it is letter B the one that alludes to the location that better represents it graphically. Many asteroids shaped irregularly and also what is called minor planets is what this belt is made of.
What are the two lengths that all ellipses have (all planets)?
A. Conic and isoconic length
B. X and Y axes
C. Horizontal and vertical length
D. Minor and major axes
Answer:
D
Explanation:
The major axis is usually the longest diameter of the eclipse while the minor axis is the shortest. It is important to note that the axes have to pass through the center of the eclipse. In a circle, the two axes are usually of equal length.
The two lengths every ellipse has are the major and minor axes, with the major axis being the longest diameter and the minor axis being the shortest. The semi-major and semi-minor axes represent half of their respective full axes. The correct option is D.
The two lengths that all ellipses have are referred to as the major and minor axes. The major axis is the longest diameter of the ellipse and spans the full width from one side to the other, going through the center. The minor axis is the shortest diameter of the ellipse, also passing through the center, perpendicular to the major axis. Half of the major axis is known as the semi-major axis, while half of the minor axis is called the semi-minor axis. The semi-major axis is often used to specify the size of the ellipse, such as in the context of planetary orbits. For example, the semi-major axis of Mars' orbit is 228 million kilometers, which represents the average distance from Mars to the Sun.
The terrestrial planets are characterized by having a ____? A.) silicate core B.) iron-rich silicate core C.) iron-rich metallic core D.) none of these
Answer:
D.) none of these
Explanation:
Which of the following describes a phenomenon that occurs when we observe plants that wilt? A. The roots begin to rot, causing them to no longer uptake water. B. The xylem releases all its water. C. The stomata close, cutting off transpiration and gas exchange. D. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere.
Answer:
A
Explanation:
Plant wilt in other terms means shriveled plant. The plant is unable to support itself and its stem and leaves lay weakly on the ground. This is mostly due to loss of turgidity that is a significant aspect in offering plant support. Turgidity is the result of the plant cells being turgid (by osmosis) and are filled with water causing the plant to be erect. If the roots, that absorb water from the soil, malfunction or die, the plant will wilt.
Answer: The xylem releases all its water describes a phenomenon that occurs when we observe plants that wilt.
A zebra mussel is discovered in a lake in Pennsylvania for the first time. Why would this make an ecologist worried?
If a zebra mussel is discovered in a lake in Pennsylvania, then the ecologist would be worried because it is an invasive species. The zebra mussel is native to Ukraine and Russia, but if it has been found in Pennsylvania, than it means that it has been introduced in this area. As an invasive species, the zebra mussel can be very dangerous for the native species in the lake. The invasive species usually are more competitive for food sources than the native species, manage to reproduce quicker, bring in diseases, and the native species tend to not have defense mechanisms for them. This leads to rapid decline or even extinction in the native species, while the invasive spreads out quickly and takes over, resulting in dramatic change in the whole ecosystem.
Which organelle plays a role in intracellular digestion?
One brief stimulus of a skeletal muscle may result in a single isolated contractile event, which is called a twitch. One twitch can generate max tension in a muscle. Are these statements true or false?
Answer:
These statements are true.
False. A muscle twitch is a response to a single stimulus and consists of a latent period, contraction, and relaxation phase. However, one twitch does not produce maximal tension.
The statements in the question are partially true and partially false. A single brief stimulus of a skeletal muscle can indeed result in a single isolated contractile event known as a muscle twitch. However, it is not true that one twitch can generate maximum tension in a muscle. A muscle twitch has three phases: a latent period, a contraction phase, and a relaxation phase. The tension produced by a single twitch can be measured but is not maximal. In order to achieve maximal tension, more motor units need to be stimulated, a process known as recruitment, which can lead to summation and tetanic contractions when stimuli occur frequently and rapidly.
A twitch occurs in response to a single stimulus and the tension produced can be affected by various factors, including the frequency of motor neuron stimulation. Multiple action potentials and an increased number of stimulated motor units are necessary to produce a sufficient amount of force for muscle contraction that can perform work.
A codon consists of __________ bases and specifies which __________ will be inserted into the polypeptide chain.
Answer:
A codon consists of three bases and specifies which amino acid will be inserted into the polypeptide chain.
Answer:
A codon consists of three bases and specifies which amino acid will be inserted into the polypeptide chain.
Explanation:
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Which pair of sentences is describing the same velocity? A. A car is parked. A car is moving in circles. B. A bus drives 40 miles per hour north. A truck drives 50 miles per hour north. C. A boy walks east at 6 kilometers per hour. A girl walks west at the same speed as the boy. D. Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.
Answer:
(D) Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.
Explanation:
Answer:
Option D, Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.
Explanation:
Velocity being a vector quantity possesses both magnitude and direction. Thus, among the given pair of sentence, the one that will describe two entities having equal magnitude and similar direction will be considered as having same velocity. Thus, option D is correct.
Here the magnitude of Valerie bike is 8 kilometers per hour and the magnitude of Owen jogs is also 8 kilometers per hour. Also the direction of their movement is same i.e in south direction.
Which of the following is NOT a part of the lithosphere?
Rocks, Water, Soil and None of the above
Answer:
D) none of the above
Explanation:
Christie's doctor recommends that she eat 40 grams of protein a day. She's already consumed 50% of her protein recommendation for the day. How many servings of the given snack should Christie have to meet her daily protein recommendation? A. 1 B. 3 C. 4 D. 6
I believe the answer is C. 4
Hope this helps.
The servings of the given snack should Christie have to meet her daily protein recommendation with C.4.
What is protein?Large, intricate molecules known as proteins play a variety of vital functions in the body. They are crucial for the structure, operation, and control of the body's tissues and organs and carry out the majority of their job inside cells.
Numerous thousands of amino acids, which are smaller building blocks of proteins, are linked together in lengthy chains to form proteins. To create a protein, 20 distinct kinds of amino acids can be mixed.
Each protein's specific function and distinctive 3-dimensional structure are determined by the order of the amino acids. Combinations of three DNA building blocks (nucleotides), which are determined by the order of genes, are used to code for amino acids.
Therefore, The servings of the given snack should Christie have to meet her daily protein recommendation with C.4.
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Match the following terms to their correct definition. 1) Transcription A) Is the process that produces two identical replicas of DNA from one original DNA molecule. 2) Translation B) Is the total genetic information possessed by an organism and at least one copy is carried in each of its cells 3) Replication C) Is the process in which messenger RNA (mRNA) is decoded by a ribosome to produce a specific amino acid chain, or polypeptide 4) Genome D) Is the process in which a particular DNA sequence is copied by RNA polymerase to produce a complementary RNA molecule
Answer:
1) Transcription--D) Is the process in which a particular DNA sequence is copied by RNA polymerase to produce a complementary RNA molecule
2) Translation--C) Is the process in which messenger RNA (mRNA) is decoded by a ribosome to produce a specific amino acid chain, or polypeptide
3) Replication--A) Is the process that produces two identical replicas of DNA from one original DNA molecule.
4) Genome--B) Is the total genetic information possessed by an organism and at least one copy is carried in each of its cells
Transcription is the process of copying a DNA sequence into a complementary RNA molecule, while translation is the decoding of mRNA to produce a specific amino acid chain. Replication is the process of producing two identical DNA molecules from one original, and the genome is the total genetic info carried by an organism.
Explanation:Matching the provided terms with their correct definitions would be as follows:
Transcription D) Is the process in which a particular DNA sequence is copied by RNA polymerase to produce a complementary RNA molecule. Translation C) Is the process in which messenger RNA (mRNA) is decoded by a ribosome to produce a specific amino acid chain, or polypeptide. Replication A) Is the process that produces two identical replicas of DNA from one original DNA molecule. Genome B) Is the total genetic information possessed by an organism and at least one copy is carried in each of its cells.
These terms are fundamental in understanding basics of genetics and molecular biology.
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Explain why the individual who is a carrier for hbv is considered a threat to public health.
Answer:
HBV (hepatitis B) is a viral infection that attacks the liver. It can cause acute or chronic disease and it is transmitted through contact of blood or other body fluids of an infected person.
An infected person can be transmitted through birth, sharing of needles, sharing of common household personal hygiene items, direct contact with an open or bloody sore, or through sexual contact.
It is a hidden treat because those who have hepatitis B can transmit it to another (blood/other body fluid); if they know they have it or not.
Acute hepatitis B is short-term (6 months after being exposed) and they can become immune and can not get infected again; but it can lead to chronic hepatitis B (depends on how healthy the person is).
Chronic hepatitis B can cause liver damage, cirrhosis, liver cancer, and death.
Explanation:
Plant life in the Paleocene epoch included the first recognizably modern _____
A. Tundras
B. Rain forests
C. Temperate forests
D. None of the above
Answer: Option (C)
Explanation: The modern plant life that existed in the paleocene epoch were the temperate forests, that came up soon after the cretaceous-tertiary mass extinction, at about 62-65 million years back, which is marked as the K-T boundary.
The temperate forest covers the region from the tropics to about 60-70° latitudes in both the hemisphere. This region is rich in deciduous forest and contains a large amount of humidity, high precipitation level and rich in plant as well as animal bio-diversities. A huge number of plant species evolved since then.
Thus, the region during the paleocene epoch helped in the expansion of variable species by providing necessary conditions for their growth and development.
Hence, the correct answer is option (C).
Releasing fungicide onto the roots of a plant would most likely result in which of the following outcomes?
A. The plant will grow faster.
B. The plant will grow slower.
C. The plant will be able to acquire minerals faster.
Releasing fungicide onto the roots of a plant would most likely result in the plant growing slower. Therefore, option B is correct
Explanation:Releasing fungicide onto the roots of a plant would most likely result in option B: The plant will grow slower. Fungicides are designed to kill or inhibit the growth of fungi, including beneficial fungi that help plants with nutrient absorption. When fungicides are applied to the roots, they can disrupt the symbiotic relationship between the plant roots and beneficial fungi, leading to slower growth and decreased nutrient uptake.
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Conscientiousness is a human trait that internalizes True or False
Answer:
True
Explanation:
Conscientiousness is a human trait that internalizes.
One similarity between cell receptors and antibodies is that both
1. are produced by nerve cells
2. are highly specific in their actions
3. slow the rates of chemical reactions
4. are involved in digestion
Answer:
The correct answer is option 2. are highly specific in their actions
Explanation:
Hello!
Let's solve this!
Receptor cells and antibodies are highly specific in their actions. Acntic bodies bind specifically to a protein. The recipient cells bind to a signaling molecule also specifically.
We conclude that the correct answer is option 2. are highly specific in their actions
The similarity between cell receptors and antibodies is that :
They are highly specific in their actions Cell receptors and antibodiesCell receptors are present in human cells in the form of proteins which receive signals passed onto a cell while antibodies help protect the human body against disease and also fight infections or diseases present in the human body as well.
Therefore both cell receptors and antibodies perform specialized function in the human body and can be said to be highly specific in their actions.
Hence we can conclude that The similarity between cell receptors and antibodies is that :They are highly specific in their actions.
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Sickle-cell anemia is an example of codominance. What implications does this have for people with one or two copies of the sickle-cell gene?
A. People with two copies of the mutated gene have sickle-cell anemia. People with one copy of the mutated gene have healthy red blood cells. B. People with two copies of the mutated gene are carriers of the disease. People with one copy of the mutated gene don't have the disease. C. People with two copies of the mutated gene have healthy red blood cells. People with one copy of the mutated gene don't have the disease but are carriers of the disease. D. People with two copies of the mutated gene have sickle-cell anemia. People with one copy of the mutated gene have both healthy and misshapen red blood cells and are carriers of the disease.
Answer:
D. People with two copies of the mutated gene have sickle-cell anemia. People with one copy of the mutated gene have both healthy and misshapen red blood cells and are carriers of the disease.
Explanation:
Sickle cell anemia is a genetic and hereditary disease, prevalent in blacks, but may also manifest in whites. It is characterized by a change in red blood cells, which lose their round and elastic shape, acquire the appearance of a sickle (hence the sickle cell name) and harden, which makes it difficult for blood to pass through small vessels and oxygenate tissues. .
Sickle cell red cells contain a type of hemoglobin, hemoglobin S, which crystallizes in the lack of oxygen, forming thrombi that block blood flow because they lack the malleability of normal red blood cells.
Sickle cell anemia is caused by genetic mutation, responsible for the deformity of red blood cells. To be a carrier of the disease, the altered gene must be transmitted by the father and the mother. If transmitted only by one parent, the child will have the sickle cell trait, which may pass on to his descendants, but not the manifest illness. Accordingly, we can conclude that people with two copies of the mutated gene (ie, feared the defective hand and father gene) have sickle cell anemia, although the disease does not manifest itself. On the other hand, people with a copy of the mutated gene have healthy and deformed red blood cells and are carriers of the disease.
which of the following is a cause of urbanization?
A-suburban homes became larger than urban homes.
B-paving over land changed the environment.
C-living in cities became more expensive than living in rural areas.
D-agricultural production became more efficient.
The following is a cause of urbanization - D-agricultural production became more efficient.
UrbanizationThe process of shifting populations from rural to urban areas, thereby leading to a higher proportion of people that live in the city.
The principal causes of urbanization include:
Industrialization and increased manufacturingreduce employment opportunities in rural areas due to more efficient agricultural systemsEconomic, political, and social factors that lead to the migration of people to industrialized/urbanized areasModernization in the infrastructure of urbanized areas.Learn more about urbanization:
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Final answer:
The correct cause of urbanization is the increased efficiency of agricultural production, which pushes former agricultural workers towards urban areas for better employment opportunities.
Explanation:
The cause of urbanization that is correct among the provided options is D-agricultural production became more efficient. Technological advances have made agriculture more efficient, requiring fewer workers, and this has pushed many former agricultural laborers to seek work in urban areas where industrial jobs are more plentiful. This migration to cities for jobs and better economic opportunities signifies urbanization.
This process often creates a range of urban challenges, including environmental impacts like urban heat islands, traffic congestion, housing shortages, and social issues such as a widening economic gap and changing urban culture. Additionally, changes in lifestyle and technological advances played a significant role in the urbanization process.
Which cells quickly respond to produce antibodies on second exposure to the same antigen?
Answer:b-cells produce antibodies or (memory b-cells)
Explanation:B cells are one of the two types of lymphocytes, the other kind being T cells. B-cells have a very specific function: the production of antibodies, which play a major role in immunity. Memory cells remember specific foreign invaders, pathogens, and antigens to fight them off if they come back in the future.
all organisms in the plant kingdom are what three things
Answer:
Multicellular organisms
--Have cell Walls
--Eukaryotic cells.
Contain photosynthetic pigments (which are present in plastids.)
--They are autotrophic mode of nutrition.
Plants are non-motile, live anchored to a substrate.
Reproduction is primarily sexual.
Explanation:
Autotroph: An organism capable of synthesizing its own food from inorganic substances using light or chemical energy
I put dashes next to the ones that I would think are the most important
Gneiss goes through metamorphosis at a higher temperature than slate so it has a higher
Answer:
Grade of metamorphism
Explanation:
Gneiss forms at a higher grade of metamophic slate. Slate forms at low metamorphic conditions just about a few temperature and pressure.
From the prolith materials exposed to metamorphic conditions, transformations begins as metamorphic changes begins to take place. First, a sediment is transformed into slate, from slate to phyllite, from phyllite to schist, schist to gneiss, gneiss to migmatite and migmatite goes back to melt. These transformation of sediments is controlled by the nature of the prolith materials and the prevailing metamorphic conditions.
Gneiss has a higher metamorphic grade than slate, characterized by high-temperature and pressure conditions that lead to its unique banded texture, known as gneissic banding, and sometimes partial melting which can result in migmatite.
Gneiss undergoes metamorphism at a higher temperature than slate, so it has a higher metamorphic grade. This transformation indicates that the rock has been subject to more intense conditions, potentially including higher pressure in addition to temperature. As a result of this high-grade metamorphism, gneiss is characterized by its coarse, banded texture, known as gneissic banding, where silicate minerals separate into dark and light bands. Similar to the process that forms schist, the conditions for forming gneiss are so extreme that some partial melting may occur, with migmatite representing a transitional phase between metamorphic and igneous rocks.
The progression from slate to phyllite to schist and ultimately to gneiss represents an increasing degree of metamorphism, with visible changes in mineral composition and rock texture. Gneiss typically forms from the metamorphism of schists or granites and most gneisses form at higher temperatures than those that support the stability of minerals like micas found in slate or phyllite.