Q: Which of the following equations correctly represents the overall reaction for aerobic glucose oxidation?

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy}$$

Question 1

Which of the following best describes the relationship between catabolism and anabolism in cellular metabolism?

Accepted Answer

Catabolism breaks down molecules to release energy, which is then used by anabolism to build new molecules.

Question 2

Which bond in ATP is responsible for its high-energy release upon hydrolysis?

Accepted Answer

Phosphoanhydride bond between the terminal two phosphates

Question 3

ATP hydrolysis is highly exergonic due to which of the following factors?

Accepted Answer

Charge repulsion, resonance stabilization, and increased entropy

Question 4

What is the standard free energy change ($$\Delta G$$^{\circ'}$$) for ATP hydrolysis?

Accepted Answer

$$\Delta G$$^{\circ'}$$ = -7.3$$ kcal/mol

Question 5

Which enzyme catalyzes the phosphorylation of glucose to glucose-6-phosphate in glycolysis, making the reaction highly exergonic and essentially irreversible?

Accepted Answer

Hexokinase

Question 6

During glycolysis, which molecule is directly responsible for the reduction of NAD+ to NADH?

Accepted Answer

Glyceraldehyde-3-phosphate

Question 7

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It involves the direct transfer of a phosphate group from a substrate to ADP, forming ATP.

Question 8

What is the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

2 ATP

Question 9

Which of the following best describes the role of NAD+ in cellular metabolism?

Accepted Answer

NAD+ is reduced to NADH, carrying electrons and protons to later stages of metabolism.

Question 10

Which of the following equations correctly represents the overall reaction for aerobic glucose oxidation?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy}$$

Question 11

Which type of organism is killed by oxygen and relies exclusively on anaerobic metabolism?

Accepted Answer

Obligate anaerobes

Question 12

Which of the following is NOT a reason why ATP hydrolysis is exergonic?

Accepted Answer

Formation of peptide bonds

Question 13

Which glycolytic intermediate is the first to be doubly phosphorylated?

Accepted Answer

Fructose-1,6-bisphosphate

Question 14

Which enzyme is responsible for the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate in glycolysis?

Accepted Answer

Phosphofructokinase-1

Question 15

Which of the following statements about glycolysis is correct?

Accepted Answer

Glycolysis occurs in the cytosol of cells.

Question 16

Which of the following best explains why the hydrolysis of AMP is less exergonic than ATP?

Accepted Answer

AMP hydrolysis produces only one resonance-stabilized product and only one charged product.

Question 17

In glycolysis, which compound is the final product before entering further metabolic pathways?

Accepted Answer

Pyruvate

Question 18

Which of the following is a correct description of the role of ATP in cellular metabolism?

Accepted Answer

ATP links catabolic and anabolic reactions by providing energy for biosynthesis.

Question 19

Which of the following best describes the process of reduction in biological systems?

Accepted Answer

Reduction is the gain of electrons, often accompanied by the gain of protons (hydrogen atoms).

Question 20

Which of the following is a plausible consequence if phosphofructokinase-1 is inhibited in a cell?

Accepted Answer

Glucose would accumulate, and glycolysis would be halted at the fructose-6-phosphate step.

Bioenergetics and Glycolysis: Cellular Energy Metabolism Study Notes

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