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3 years ago

In genetic drift, the allele frequencies in a gene pool change because of

1 answer:

vladimir2022 [97]3 years ago

6 0

In genetic drift,the allele frequencies in a gene pool change because of chance. Genetic drift is the variation of the allele and relative frequencies of different genotypes in a very small community or population, and focusing on the particular genes which did not produce or just happened to be gone.

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Chittenango falls state park in central new york state is the only known habitat for an endangered species of aquatic snail. con

Marina CMI [18]

This first step to protecting this endangered species of snail is to preserve its existing habitat. This means that steps need to be taken to ensure that <span>Chittenango Falls state park continues to offer a refuge to this snail, and that steps are taken to improve the water quality in the park. A scientific study can be run to identify the pollutants and their concentrations that are having a negative effect on the snail species. For this, water quality testing can be conducted to first identify any pollutants. Once suspect pollutants are identified, ecotoxicology tests can be run to identify concentrations of the pollutants that have an effect on the snail. Both acute (short term) and chronic (long term) tests would have to be conducted, looking at mortality as well as sub-acute end points such as growth and reproduction. Once concentrations of pollutants are identified that would negatively affect the snail, we can call these 'water quality guidelines' that we would need to keep water quality within. We can then identify sources of these pollutants upstream, and take steps to reduce the pollution at source, by forcing factories to treat their water more rigorously or changing upstream land use. Finally, what can also be considered is introducing the snail species to new habitat within the State of New York. We must be careful here though as the actions of man have spread invasive species globally. </span>

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3 years ago

The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of:__________

V125BC [204]

The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of fatty acids.

<h3>Write about Bacterial cell wall.</h3>

In bacteria, the cell wall forms a rigid structure of uniform thickness around the cell and is responsible for the characteristic shape of the cell (rod, coccus, or spiral).

Inside the cell wall (or rigid peptidoglycan layer) is the plasma (cytoplasmic) membrane; this is usually closely opposed to the wall layer.

It is also important to note that most bacteria (about 90%) have a cell wall and they typically have one of two types: a gram positive cell wall or a gram negative cell wall.

Both gram positive and gram negative cell walls contain an ingredient known as peptidoglycan (also known as murein).

This particular substance hasn’t been found anywhere else on Earth, other than the cell walls of bacteria.

The bacterial cell wall performs several functions as well, in addition to providing overall strength to the cell. It also helps maintain the cell shape, which is important for how the cell will grow, reproduce, obtain nutrients, and move.

It protects the cell from osmotic lysis, as the cell moves from one environment to another or transports nutrients from its surroundings.

To learn more about Bacterial cell wall,

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2 years ago

Summarize the steps that occur in the process of chromosomal DNA replication. Please place the following steps in the proper ord

grandymaker [24]

Answer:

The proper order is:

A. DnaA proteins bind to the origin of replication, resulting in the separation of the AT-rich region.

B. DNA helicase breaks the hydrogen bonds between the DNA strands, topoisomerases alleviate positive supercoiling, and single-strand binding proteins hold the parental strands apart.

C. Topoisomerases unravel the intertwined chromosomes, if necessary.

D. Primase synthesizes one RNA primer in the leading strand and many RNA primers in the lagging strand, and DNA polymerase III synthesizes the daughter strands of DNA.

E. DNA polymerase I removes the RNA primers and fills in that region with DNA, and DNA ligase covalently links Okazaki fragments together.

F. Replication continues until the two replication forks meet on the other side of the circular bacterial chromosome.

Explanation:

The process of DNA replication in prokaryotes starts at a point called ORIGIN OF REPLICATION. This site is where certain proteins recognize and bind to in order to kickstart the replication process. The following are orderly processes of DNA replication.

- DnaA proteins bind to the origin of replication, resulting in the separation of the AT-rich region.

- DNA helicase breaks the hydrogen bonds between the DNA strands to form two replication forks, topoisomerases prevent supercoiling of these separated DNA, and single-strand binding proteins hold the parental single strands apart, hence, making sure that they do not rewind again.

- In case DNA rewinds, topoisomerases unravel or disentangles the intertwined chromosomes, if necessary.

- DNA Primase synthesizes one RNA primer in the leading strand and many RNA primers in the lagging strand,which allows DNA polymerase III synthesize the daughter strands of DNA. Note that the synthesis of nucleotides on threading strand is continuous while nucleotides are synthesized in small fragments called OKAZAKI FRAGMENTS, on the lagging strand.

- DNA polymerase I removes the RNA primers and replaces with synthesized DNA in that region, and DNA ligase covalently links the Okazaki fragments (small fragments of DNA) together.

- Replication continues until the two replication forks meet on the other side of the circular bacterial chromosome.

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4 years ago

The water cycle collects, purifies, and distributes the earth's fixed supply of water.

kotykmax [81]

Answer:

What is the main energy source, or the motive force, of the movement of water between reservoirs?

The Correct Answer B. water currents

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Happy Labor day!

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3 years ago

What is the key factor in determining the habitable zone of a planet

FrozenT [24]

Answer:

The key factor in determining the habitable zone of a planet is looking for a Earth-like planet that is able to have water on it's surface, and make sure that it can still give or support life.

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3 years ago

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