the answer is D because i just took the test hope this helps
Answer:
antibodies :)
Explanation:
Which term best characterizes the role of corals in a coral reef ecosystem?
O
A. Photosynthetic
B. Parasitic
C. Abiotic
D. Biotic
Answer:
D. Biotic
Explanation:
Biotic best characterizes the role of corals in a coral reef ecosystem.
Liquid water turns into water vapor at which step in the water cycle
Answer:
When water is collected from vapour form to liquid form then this process is known as condensation.
For example, water evaporated from the atmosphere reaches to the clouds and it gets converted into liquid form and again reaches to Earth in the form of rain.
Thus, we can conclude that process in which water vapor turns to liquid is called condensation.
Answer:
Liquid water turns into water vapor when it evaporates, so it fits into the evaporation step in the water cycle.
What is is called when group of organisms show rapid rate of diversification in their form for a period of time A)adaptive radiation B) extinction C)macroevolution D)speciation
Answer:
B - Extinction.
Explanation:
The organisms are rapidly become diverse from each other, causing the extinction of the original organism.
how many electrons are in outermost energy level of an oxygen atom as it shares electrons with hydrogen atoms as part of a water molecule
Answer:
8 electrons
Explanation:
This gives each hydrogen atom two electrons in its outer energy level, which is full. It also gives oxygen 8 electrons in its outer energy level, which is also full.
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hydrogen atom two electrons in its outer energy level, which is full. It also gives oxygen 8 electrons in its outer energy level, which is also full.
Susan is planting her garden and choosing plants at the local plant nursery. She tells the clerk that she wants to plant perennials in her front garden bed. How often is Susan expecting the plants that she chooses to germinate and flower? A. Grow into larger, permanent trees and shrubs
B. Sprout every year for two years
C. Sprout every year, year after year
D. Sprout this year and need to be replanted
Answer:
C. Sprout every year, year after year
Explanation:
The perennial plants are the plants that live for more then two years, thous some may argue that they are plants that live more then three years. Whichever the case, they are not short-lived plants, but are capable of surviving for numerous years, unlike the annuals and biennials. Theoretically, the shrubs and trees would fall into this category, but they are classified separately, and this term is not used for them, but for smaller plants that do not have or have very little woody parts. These plants tend to sprout every year, and even though they seemingly die in the autumn, their roots are alive, and they emerge and grow again in the spring, sprouting again. That process repeats itself for numerous years.
Answer:
The correct answer will be option C.
Explanation:
Perennials the plants which grow for more than two seasons form the grown parts of the same plant.
The seeds of the plants are not to be sown every year as they sprout from the same part of the plant called root after they die out during winter. After winter the same root again forms the plants like observed in flowering plants of Hibiscus and Daisies.
Thus, option C-sprout every year, year after year is the correct answer.
What kinds of cells can develop from unipotent stem cells
Unipotent These stem cells can produce only one cell type but have the property of self- renewal that distinguishes them from non-stem cells.
Examples of a unipotent stem cell are a germ line stem cell (producing sperm) and an epidermal stem cell (producing skin)
What stem cells are unipotent?Stem cells are cells with the potential to develop into many different types of cells in the body. They serve as a repair system for the body.
There are two main types of stem cells: embryonic stem cells and adult stem cells.
What is true of unipotent stem cells?They work to replenish the cells throughout an individual's life, but can be repurposed to serve another tissue or organ. Unipotent stem cells are derived from other types of stem cells, but at some point, differentiate themselves to become a specific type of tissue.
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How are organisms in the domains Bacteria and Archaea similar?
A. They are protists.
B. They are ancestors of eukaryotes.
C. They have membrane enclosed organelles.
D. They lack a nucleus.
Answer:
D
Explanation:
they are prokaryotes thus do not have a nucleus and membrane-bound organelles
The organisms in the domains Bacteria and Archaea are similar as they lack a nucleus. Thus, the correct option is D.
What do you mean by Archaea?Archaea may be defined as the unicellular microorganisms that do not have internal membranes but both have a cell wall composed of various polysaccharides and glycoconjugates and use flagella to swim.
Both bacteria and archaea are prokaryotes and do not have a nucleus and well-defined membrane-bound cell organelles.
Therefore, the correct option is D.
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Which of the following is NOT a piece of evidence of evolution?
Which of the following statements is considered true of Neanderthals?
A. They evolved into homo sapiens.
B. They had some system of religious beliefs about afterlife.
C. They had smaller brains than homo sapiens (modern humans).
D. They emerged after the ice age.
Answer: B. They had some system of religious beliefs about afterlife.
Explanation:
Neanderthals are believed to have had some system of religious beliefs because they buried their dead. They did not evolve into modern humans but rather interbred with them and had larger brains compared to Homo sapiens. Neanderthals lived during the ice age, not after, and were well-adapted to cold climates.
Explanation:The correct statement about Neanderthals is that they had some system of religious beliefs about the afterlife. Archaeological evidence, such as burial sites, suggest this could be true as they buried their dead, which may imply a belief in an afterlife. Neanderthals evolved from Homo erectus and did not evolve into Homo sapiens (modern humans), but they did interbreed with them.
Neanderthals had larger brains in absolute terms compared to modern humans, although their brain size is typically considered in proportion to their overall more robust body size. They lived during the ice age, thus they did not emerge after it. Neanderthals, indeed a distinct group from Homo sapiens sapiens, showed a great capacity to adapt to cold climates and had strong, muscular builds suited for survival in harsh conditions.
How wide would the sun be in your model?
Answer:
865,000
Explanation:
all you have to do is change the miles into inches
The answer you are looking for is A. 865.
This is found by simply dividing 865,000 by 1,000. This is because every 1,000 miles = 1 inch (according to the scale given within the question). Thus making A. 865 your answer.
I hope this helps!
two alleles/letters for one trait that are different is called
When two alleles for a trait are different, the term for this is heterozygous. A person with two different alleles for a gene, such as Aa, is considered heterozygous.
When two alleles for one trait that are different, it is called heterozygous. These alleles, which are variations of a gene, reside on homologous chromosomes and each is inherited from one parent. Being heterozygous for a gene means that the individual has two different alleles, which could be represented, for example, as Aa where 'A' is the dominant allele and 'a' is the recessive allele. This differs from being homozygous, where both alleles would be the same, either dominant (AA) or recessive (aa).
Which of the following soil types is most vulnerable to wind erosion?
Clay soils
Loamy soils
Coarse sand
Rocky soil
(I’m between B and C...)
Answer is:
Coarse sand - C
Answer:
Loamy Soils
Explanation:
Loamy soil is "made of small, light, and nutrient rich soil particles."
What happens as electrons move along the chain of molecules known as the electron transport chain?
They gain energy, which causes ATP molecules to lose phosphate groups.
They gain energy, which causes H *ions to join with oxygen to produce water.
They lose energy, which is then used by the cell to make ATP.
They lose energy, which is then used to break down ATP.
Answer:
The correct answer is the third statement.
Explanation:
ETS or electron transport chain is the last stage of aerobic cellular respiration that leads to the formation of a huge amount of adenosine triphosphate also known as ATP which is the energy currency of the cell.
It occurs in the inner mitochondrial membrane. Electrons are passed through various protein complexes present in the inner membrane of mitochondria.
As electrons pass through the electron transport chain, electrons move from a higher to a lower energy level and are ultimately passed to oxygen.
During this process, Energy release in the electron transport chain is trapped as a proton gradient. Due to this concentration gradient, ATP synthase is a final protein complex, forms ATP.
Thus, the correct answer is the third statement.
Easter Island is a small island in the southern Pacific Ocean. It lies approximately 3,500 kilometers east of Chile and is considered one of the most remote islands. It is also a volcanic island. In 2025, Easter Island had a population of 16,000. However, many of the island’s residents were killed during a series of volcanic eruptions that occurred in the year 2065. Of the original population, only 200 people survived. It is now 100 years later, and the population of Easter Island has reached 800. Of the current population, 328 people are homozygous recessive for Marfan syndrome, which is autosomal (mm genotype). Marfan syndrome is a genetic disorder that affects the connective tissue. Symptoms of Marfan syndrome include increased height, thinness, flexible joints, heart complications, and long arms, legs, fingers, and toes.
q^2 -
q -
p -
p^2 -
2pq -
Use this information to help you answer the following questions:
The original population’s actual genotype frequencies were: MM – 0.42, Mm – 0.13, mm – 0.45.
1.) Is the current population in Hardy - Weinberg equilibrium? Yes or No
2.) Is the current population evolving? Yes or No
3.) If the current population is evolving, what type of effect is responsible for genetic drift?
A. Yes, the current population in Hardy - Weinberg equilibrium follows.
p = 0.36 (dominant allele)
q = 0.64 (recessive allele)
p² = 0.13
2pq = 0.46
q² = 0.41
What is hardy Weinberg equation?The Hardy-Weinberg equation is a mathematical equation used to calculate the genetic variation of a population at equilibrium.
Here, we need to use the Hardy-Weinberg equations:
p + q = 1
p² + 2pq + q² = 1
p: the frequency of the dominant allele
q: the frequency of the recessive allele
p²: the frequency of homozygous dominant
2pq: the frequency of heterozygous
q²: the frequency of homozygous recessive
Here, we know that 328/800 people are homozygous recessive, which means that q² = 328/800 = 0.41.
Then, q = √0.41 = 0.64, and p = 1 - q = 1 - 0.64 = 0.36.
Now, we have p² = (0.36)² = 0.1296 ≈ 0.13 and 2pq = 2 * 0.36 * 0.64 = 0.4608 ≈ 0.46.
Final answer:
p = 0.36
q = 0.64
p² = 0.13
2pq = 0.46
q² = 0.41
B. To know if a population is in Hardy-Weinberg Equilibrium scientists have to observe at least two generations. If the allele frequencies are the same for both generations then the population is in Hardy-Weinberg Equilibrium. Yes, the current population in Hardy - Weinberg equilibrium.
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Down syndrome, the most common genetic condition in the United States, is also called trisomy 21. What does this mean?
A. A person with Down syndrome has two copies of chromosome 21 but they're fused together. During early embryo development, these chromosomes didn't segregate properly.
B. A person with Down syndrome has only one copy of chromosome 21 instead of two copies. Either the sperm cell or the egg cell was lacking this chromosome.
C. A person with Down syndrome has three copies of chromosome 21 instead of two copies. An extra chromosome 21 was present in either the sperm or the egg cell.
D. A person with Down syndrome has three copies of chromosome 21 instead of two copies. Two sperm cells simultaneously fertilized the egg cell.
Trisomy=3 chromosomes; 1 more than the required pair (2)
21=the type of chromosome
So, here we can eliminate A and B.
Now we have C and D.
I know that when sperm cell(s) simultaneously fertilize [an] egg, a class of identical twins will form. Therefore, we can eliminate D, leaving us with merely C. Henceforth, C is your final answer.
Answer:
The correct answer option is C. A person with Down syndrome has three copies of chromosome 21 instead of two copies. An extra chromosome 21 was present in either the sperm or the egg cell.
Explanation:
Down Syndrome is the most genetic condition in the United States caused by the error in the cell division called 'disjunction'.
A normal person has two copies of chromosome 21 while a person with down syndrome has three copies of it in either the sperm or the egg which fails to separate.
In human males, the process of cell division, meiosis occurs in cells of the:
Answer:
testes
Explanation:
In human males, the process of cell division, meiosis occurs in cells of the testes.
The process of Meiosis occurs in the sexual organs of sexually reproducing organisms,
Macromolecules that contain carbon , hydrogen and oxygen in a 1:2:1 ratio is called ?
Answer/Explanation: Carbohydrates contain carbon, hydrogen and oxygen atoms with the ratio of hydrogen atoms to oxygen atoms in the ration of 2 hydrogen atoms to 1 oxygen atoms (2H : 10) such as in sucrose or table sugar C12H22011. It is Carbohydrates are a ready source of energy.
Macromolecules that contain carbon, hydrogen and oxygen in a 1:2:1 ratio are called carbohydrates.
Which group of molecules has a ratio of 1 carbon 2 hydrogens 1 oxygen?
Carbohydrates are a group of organic compounds containing a ratio of one carbon atom to two hydrogen atoms to one oxygen atom.
Do all carbohydrates have a 2:1 ratio?Carbohydrates are a class of chemical compounds composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio, respectively.
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Your home is located in a deep river valley less than a mile from where the river flows into the Gulf of Mexico. A hurricane is growing in the Gulf of Mexico, and warnings have been issued that the storm will touch ground within two days.
Which safety measures should you take?
Go to a shelter farther inland on higher ground.
Stay indoors and close your windows.
Board up your windows and go to your basement.
Open windows and doors to equalize pressure.
Answer: Go to a shelter farther inland on higher ground.
Explanation:
A hurricane is a tropical cyclone in which the air rotates in low pressure. It is an organized thunderstorm which has no fronts (a boundary that separates the two air masses which are of typically of different densities). The speed of the wind in this cyclone is 74 mph.
Go to a shelter farther inland on higher ground. is the correct approach. This is because of the fact that hurricane can cause the flow of water from the river at high tide. Thus it will be suitable that a person attains a shelter to higher grounds to keep itself save.
Answer:
A: go to a shelter farther inland on higher ground.
Explanation:
I did it it’s correct
How can a geological time scale BEST be reconstructed?
A) Comparing vestigial structures in living species .
B) Comparing homologous structures in living species.
C) examining homologous structures in fossil remains.
D) examining the written records of scientist from past structures.
C.
This makes the most sense to me. Studying fossils is how it is usually done. Many things can be told from this.
Answer:
The answer examining homologous structures in fossil remains
Explanation:
It is possible to get an idea of how things change and evolve by comparing how fossils change over time.
Which of the following accurately describes the correct order of events in the process of transpiration within a plant?
A. Water is absorbed through the leaves, is transported through the stem, and nourishes the roots.
B. Water enters the roots, passes through the leaves, and leaks through the stem pores.
C. Water is absorbed through the leaves, nourishes the roots, and leaks through the stem pores.
D. Water enters the roots, gets transported through the stem, and evaporates through the leaves.
Answer:
D) Water enters the roots, gets transported through the stem, and evaporates through the leaves
Answer:
The correct answer is option D.
Explanation:
The transpiration is the process in which plants carry water or moisture via roots to the small pores present underside of leaves where it converted into vapor and released to the atmosphere.
It takes place mainly at the leaves. Stomata are open for the exchange or passage of CO₂ and O₂ during photosynthesis.
Two functions of the transpiration are -
(1) Deploys a cooling effect on plants.
(2)Maintenance of water balance and uptake of salts, minerals.
Thus, the correct answer is option D.
Which of these genes is not a part of the lac operon
Answer:
Can you show the different genres so I can tell you wich one it is
Explanation:
The correct answer is repressor gene (C).
The gene that is not part of the lac operon is the repressor gene. The lac operon includes structural genes, a promoter, and an operator, while the repressor gene is located upstream and regulates the operon's activity.
The lac operon in E. coli contains three structural genes (lacZ, lacY, and lacA), a promoter, and an operator gene. The repressor gene, however, is not part of the lac operon itself; it is a separate gene located upstream of the operon that produces the repressor protein which binds to the operator region to regulate transcription.
Key Points About the lac Operon:
It consists of three structural genes: lacZ, lacY, and lacA.The promoter and operator regions are essential for the transcription control of these genes.The repressor gene is separate and not part of the lac operon but influences its activity.Complete Question:
Which of these genes is not a part of the lac operon?
A. operator gene
B. promoter gene
C. repressor gene
Which best describes the chemical reaction taking place?
Answer:
Hydrolysis of disaccharides
Explanation:
The correct option is (C).
This statement correctly describes a chemical reaction. Chemical reactions involve the breaking of existing chemical bonds in the reactant molecules and the formation of new chemical bonds to produce the products. During a chemical reaction, the arrangement of atoms is rearranged, resulting in the formation of different molecules with new chemical properties. The breaking and formation of chemical bonds involve the transfer or sharing of electrons between atoms, leading to the creation of new substances.
In a chemical reaction, reactant molecules are consumed and transformed into products. The products of a chemical reaction are the substances that result from the rearrangement of atoms in the reactants. Reactants do not "come out" of a reaction unchanged; instead, they are converted into products.
In chemical reactions, energy may be released or absorbed, depending on the specific reaction and the nature of the reactants and products involved. Some reactions release energy in the form of heat (exothermic reactions), while others absorb energy from the surroundings (endothermic reactions). The release or absorption of energy depends on factors such as bond energies and reaction conditions.
In a chemical reaction, reactants are the starting materials that undergo chemical changes to produce products. Products are the substances that are formed as a result of the reaction. Reactants are transformed into products during the course of the reaction, but products do not "go into" the reaction as starting materials.
complete question given below:
Which statement correctly describes a chemical reaction?
A. Reactants come out of a reaction.
B. Energy is always released.
C. Bonds between atoms break and reform.
D. Products go into a reaction.
what is a substance dissolved in water called
solute is the thing being dissolved and the solvent is the thing that dissolves it. so the water is the solvent and etc
What is the answer for B?
Answer:
wheres b?
Explanation:
What is phenotype frequency?
Answer:
Phenotype frequency is the representation of number of individual in a cross/population belonging to/or carrying a specific trait or characteristics.
Explanation:
Phenotype frequency is the representation of number of individual in a cross/population belonging to/or carrying a specific trait or characteristics.
For example -
Green color of pea plant is dominant over yellow color. Color is a phenotype.
When a green pod pea plant (GG) is crossed with a yellow pod pea plant (gg) , then the following offspring will be produced -
GG x gg
Gg, Gg, Gg, Gg
We can see that all the offspring in the first generation cross between GG and gg are green in color. Thus, frequency of green color pods (Phenotypic frequency) in I generation is 100%.
How is anaerobic respiration affect by changes in temperature ?
Based on the conditions of early earth, what conclusions you draw about the amount of anaerobic respiration that was occurring at Earths beginning ?Explain your answer
If there was a sudden drop in the temperature after the evolution of the first living cells,
predict how that might have affected the changes in the atmosphere and the evolution of cyanobacteria and other autotrophs. Explain your answer.
Answer:
The rising temperature will increase the rate of anaerobic respiration, up to a point. Beyond that the heat will start putting a stress on the organismand the rate will go down. More heat will eventually kill the organelles.
which kind of electrical charge is found on a hydrogen atom of a polar water molecule
Answer:
it would have a positive charge.
Insects, in contrast to chordates, have what feature in their nervous system?
A. Nerve net
B. Ventral nerve cord
C. No brain
D. Dorsal nerve cord
Answer: Ventral nerve cord
Explanation: The nervous system of the insects are very simple that consists of specialized cells.
It contains a network of cells that is used to generate electrical impulse that is circulated throughout the body.
Insects consists of a simple nervous system with a dorsal brain linked to a ventral nerve cord.
Answer:b ventral nerve cord
Explanation:
Which is one of the three domains?
-Eukarya
-Protista
-Animalia
-viruses
Answer: Eukarya.
Explanation: The domains are Archaea, Bacteria, and Eukarya.
Answer:
Eukarya is the correct answer.
Explanation:
organisms are grouped into three domains based on the difference in nucleotides sequences in the rRNA and lipid structure in the cell membrane.
There are three domains
Archaea( they do not have a nuclear membrane) bacteria(they do not have a nuclear membrane )prokaryotic organisum are the member to the Archaea domain or bacteria domain
3.Eukarya( they have a membrane-bound nucleus)
Eukaryotic organisms are the part to the eukarya domain.
Describe the two types of vascular tissue
Answer:
1; Xylem 2; phloemExplanation: