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Tutor profile: Nam V.

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Nam V.
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Questions

Subject: Writing

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Question:

Vague pronounce references are errors commonly found even in college. Here are some examples of vague pronounce references: Clara’s paper revealed little revision between each draft. It lowered her grade. or Clara’s paper revealed little revision between each draft, which lowered her grade.

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Nam V.
Answer:

A pronounce should clearly refer to the noun it replaces (called antecedent). Vague pronoun references include words such as which, it, this, and that, and can leave the reader questioning what or to whom the pronoun refers. In situations where more than one word could be the antecedent, or if no specific antecedent is present, edit to make the meaning of the sentence more clear. The first sentence above should have "it" replaced with a noun or a phrase: Clara's paper revealed little revision between each draft, and the lack of effort resulted in a lower grade. The second sentence should add a noun before "which": Clara’s paper revealed little revision between each draft, a problem which resulted in a lower grade. In addition, "which" should be replaced with "that": Clara’s paper revealed little revision between each draft, a problem that resulted in a lower grade.

Subject: Biochemistry

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Question:

For Map Kinase to become active, the amino acids 183 and 185 of its catalytic domain have to be phosphorylated. To make an inactive mutant of Map kinase, what type of amino acids can we substitute for?

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Nam V.
Answer:

We know that enzymes typically get phosphorylated on serine and threonine. Both of these two amino acids are polar due to their hydroxyl group in their side chain. Phosphate is covalently bonded to the hydroxyl group during phosphorylation. Therefore, if we substituted the amino acids with ex Guanine and Adenine which do not contain hydroxyl groups in the side chain, we would render the enzyme inactive as they cannot be phosphorylated,

Subject: Calculus

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Question:

Find the value of K to make the function continuous. Ex. h(x) = {x^2 if x≤4 & x+k if x> 4

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Nam V.
Answer:

We know that f(x) is continuous if limx→a f(x) = f(a), which means that the global limit as x approaches a exists and it's exactly equal to f(a). Therfore we can say that lim x→4+ h(x) = lim x→4− h(x)= h(4) And we know h(x) as we approach limit from 4+ is x+k. We also know that h(x) as we approach limit from 4- is x^2 We can then write the equation as Iim x→4+ x+k=limx→4− x^2 or simply x+k=x^2 Since we want to find k to make the function continuous as we approach x= 4 from both sides, we plug in 4 for x, then solve for k. 4+k=4^2 which should give us k=12

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