Q: Which equation correctly relates pH, pKa, and the ratio of conjugate base to acid according to the Henderson-Hasselbalch equation?

$$\text{pH} = \text{pKa} + \log_{10}\left(\frac{[\text{A}^-]}{[\text{HA}]} ight)$$

Question 1

Which of the following best describes the hydrophobic effect in biochemistry?

Accepted Answer

It is the tendency of nonpolar molecules to aggregate in water, increasing entropy.

Question 2

Which equation correctly relates pH, pKa, and the ratio of conjugate base to acid according to the Henderson-Hasselbalch equation?

Accepted Answer

$$	ext{pH} = 	ext{pKa} + \log_{10}\left(\frac{[	ext{A}^-]}{[	ext{HA}]}ight)$$

Question 3

Which property of water is most responsible for its ability to dissolve ionic compounds?

Accepted Answer

Polarity

Question 4

A patient with sickle cell anemia has a mutation in hemoglobin that replaces glutamate with valine. What is the biochemical consequence of this mutation?

Accepted Answer

Formation of hydrophobic patches leading to aggregation

Question 5

Which amino acid is most likely to be found in the interior of a globular protein?

Accepted Answer

Valine

Question 6

Which of the following is a post-translational modification that is essential for collagen stability?

Accepted Answer

Hydroxylation of proline and lysine

Question 7

Which protein analysis technique separates proteins primarily based on their molecular weight?

Accepted Answer

SDS-PAGE (Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis)

Question 8

Which enzyme mechanism involves a nucleophile forming a covalent bond with part of the substrate during catalysis?

Accepted Answer

Covalent catalysis

Question 9

Which of the following statements about competitive enzyme inhibition is correct?

Accepted Answer

The inhibitor binds to the active site, increasing Km.

Question 10

Which of the following is the correct formula for Gibbs free energy change ($$\Delta G$$)?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 11

Which carbohydrate is highly branched and serves as the main energy storage molecule in animals?

Accepted Answer

Glycogen

Question 12

Which of the following is a reducing sugar?

Accepted Answer

Lactose

Question 13

Which of the following best explains why ATP is considered a high-energy molecule?

Accepted Answer

It has high-energy phosphoanhydride bonds.

Question 14

During glycolysis, which enzyme catalyzes the conversion of glucose to glucose-6-phosphate?

Accepted Answer

Hexokinase

Question 15

Which of the following is true about the electron transport chain (ETC)?

Accepted Answer

It uses oxygen as the final electron acceptor.

Question 16

Which vitamin is required as a cofactor for the hydroxylation of proline and lysine during collagen synthesis?

Accepted Answer

Vitamin C

Question 17

Which of the following best describes the induced fit model of enzyme-substrate binding?

Accepted Answer

The enzyme changes shape upon substrate binding to better accommodate the substrate.

Question 18

Which of the following is a function of dietary fiber in human nutrition?

Accepted Answer

Promotes healthy gut microbiota and regular bowel movements

Question 19

Which of the following statements about hemoglobin is correct?

Accepted Answer

Hemoglobin exhibits cooperative binding of oxygen.

Question 20

Which of the following is the correct net equation for aerobic glycolysis?

Accepted Answer

$$	ext{Glucose} + 2 	ext{ADP} + 2 	ext{Pi} ightarrow 2 	ext{Pyruvate} + 2 	ext{ATP} + 2 	ext{NADH}$$

Comprehensive Biochemistry and Molecular Biology Study Guide

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