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Tutor profile: Kevin X.

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Kevin X.
PhD Candidate and Teaching Assistant for Biology (5 Years)
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Questions

Subject: Natural Sciences

TutorMe
Question:

Why are viruses widely considered to not be organisms?

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Kevin X.
Answer:

Although viruses often carry many of the biological components similar to live cells, they lack a significant repertoire of cellular machinery necessary for them to survive and proliferate independently. Viruses will often carry their own polymerases and genetic material, but will ultimately rely upon infecting an appropriate host. Once a virus particle infects a live cell, it can utilize nutrients and proteins such as the ribosome to reproduce itself. Thus, viruses are not considered to be truly living.

Subject: Biochemistry

TutorMe
Question:

For enzyme inhibition, how do competitive inhibitors differ from noncompetitive inhibitors?

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Kevin X.
Answer:

Generally, competitive inhibitors will bind to the active site of an enzyme, thereby preventing the binding of the enzyme's usual ligand or substrate. Noncompetitive inhibitors will generally bind to a site alternative to the active site. This site is often called the allosteric binding site and the subsequent binding can prevent the enzymatic activity of the protein itself. It is worth noting that neither forms of inhibition necessitate the breakdown or denaturation of the enzyme itself. Moreover, the effects of competitive inhibition can usually be reduced by diluting the inhibitor with the enzyme's preferred substrate.

Subject: Biology

TutorMe
Question:

What three major steps does a cell have to perform to express proteins from its genetic material?

Inactive
Kevin X.
Answer:

In brief, a cell will have to transcribe the DNA sequence of interest into RNA and then translate this newly formed messenger RNA into a protein sequence with the help of ribosomes.

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