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Tutor profile: Fi V.

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Fi V.
Science and writing tutor for 3 years
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Questions

Subject: MCAT

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Question:

What is the collision theory of chemical kinetics?

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Fi V.
Answer:

The collision theory posits that chemical reactions can take place when the molecules involved collide with each other. This explains why reactions occur more quickly at high temperatures: the molecules have greater kinetic energy and move more quickly, which increases the chance that they will collide.

Subject: Literature

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Question:

What is Mikhail Bakhtin's theory of polyphony in literature?

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Fi V.
Answer:

According to Bakhtin's theory, so-called polyphonic novels are not constructed as the whole of a single consciousness presented by an authoritative narrator. Instead, these novels are composed of the interactions of several consciousnesses that are represented by the various characters. This prevents the reader from drawing any concrete conclusions about the story's objective reality. In fact, the reader becomes a participant in the story as well.

Subject: Biochemistry

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Question:

A patient has a deficiency of the enzyme lactate dehydrogenase (LDH). Which intermediate in the glycolytic pathway is likely to accumulate as a result?

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Fi V.
Answer:

Glyceraldehyde-3-phosphate will accumulate in the patient's cells. Normally, the conversion of pyruvate to lactate (catalyzed by LDH) produces NAD+, which is necessary for the conversion of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate. Without sufficient amounts of LDH, less NAD+ will be produced, meaning that the glycolytic pathway will bottleneck at the step involving glyceraldehyde-3-phosphate.

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