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Tutor profile: Chau N.

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Chau N.
Biochemistry TA
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Questions

Subject: Chemistry

TutorMe
Question:

State and explain which of propan-1-ol, $$ CH_{3}CH_{2}CH_{2}OH $$, and methoxyethane, $$ CH_{3}OCH_{2}CH_{3} $$, is more volatile.

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Chau N.
Answer:

Methoxyethane, $$ CH_{3}OCH_{2}CH_{3} $$, is more volatile because its molecules interact with each other through dipole-dipole and van der Waals' forces. Propan-1-ol molecules interact with each other through hydrogen bonding. Hydrogen bonding is stronger than dipole-dipole and van der Waals' forces.

Subject: Biochemistry

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Question:

Why must citrate be isomerized to isocitrate before any oxidation can occur in the citric acid cycle?

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Chau N.
Answer:

The hydroxyl group in the citrate molecule is not located on the carbon that would give the structure of alpha-ketoglutarate after oxidative decarboxylation. Thus, citrate is isomerized into isocitrate to allow the following oxidation and decarboxylation steps in the citric acid cycle.

Subject: Biology

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Question:

Describe the secretory pathway of the endomembrane system.

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Chau N.
Answer:

It is the route through the cytoplasm by which materials, such as proteins and lipids, are synthesized in the endoplasmic reticulum (ER) or Golgi complex, modified during passage through the Golgi complex, and transported through the cytoplasm to various destinations such as the plasma membrane, lysosomes, or plant cell vacuoles. The transport of the materials between these organelles and membranes occurs in vesicles.

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