Q: Which of the following equations correctly represents the overall reaction for alcoholic fermentation in yeast?

$$\text{glucose} + 2\text{ADP} + 2P_i + 2H^+ \rightarrow 2\text{ethanol} + 2CO_2 + 2\text{ATP}$$

Q: Which of the following is the correct balanced equation for glycolysis?

$$\text{glucose} + 2NAD^+ + 2ADP + 2P_i \rightarrow 2\text{pyruvate} + 2NADH + 2H^+ + 2ATP$$

Question 1

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP is a universal energy coupler, transferring energy from catabolic to anabolic processes.

Question 2

What is the net gain of ATP molecules per molecule of glucose during glycolysis?

Accepted Answer

$$2$$

Question 3

Which enzyme catalyzes the phosphorylation of glucose to glucose-6-phosphate in the first step of glycolysis?

Accepted Answer

Hexokinase

Question 4

The hydrolysis of ATP to ADP and $$P_i is $$highly exergonic. What is the standard free energy change ($$\Delta G^\circ') $$for this reaction?

Accepted Answer

$$-7.3$$ kcal/mol

Question 5

During glycolysis, which molecule has the highest phosphoryl transfer potential?

Accepted Answer

Phosphoenolpyruvate (PEP)

Question 6

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

Accepted Answer

It involves the direct transfer of a phosphate group to ADP from a phosphorylated intermediate.

Question 7

Which of the following best explains why glycolysis can occur in both aerobic and anaerobic conditions?

Accepted Answer

Glycolysis does not require oxygen as a reactant.

Question 8

In the absence of oxygen, what is the fate of pyruvate in human muscle cells?

Accepted Answer

It is converted to lactate.

Question 9

Which of the following equations correctly represents the overall reaction for alcoholic fermentation in yeast?

Accepted Answer

$$	ext{glucose} + 2	ext{ADP} + 2P_i + 2H^+ ightarrow 2	ext{ethanol} + 2CO_2 + 2	ext{ATP}$$

Question 10

Which enzyme is responsible for the regulation of glycolysis at the step converting fructose-6-phosphate to fructose-1,6-bisphosphate?

Accepted Answer

Phosphofructokinase

Question 11

A patient with a deficiency in lactate dehydrogenase would have trouble performing which metabolic process during intense exercise?

Accepted Answer

Converting pyruvate to lactate

Question 12

Which of the following best describes the difference between obligate aerobes and obligate anaerobes?

Accepted Answer

Obligate aerobes require oxygen for survival, while obligate anaerobes are killed by oxygen.

Question 13

Which of the following statements about the regulation of glycolysis and gluconeogenesis is correct?

Accepted Answer

Phosphofructokinase-2 (PFK-2) and fructose bisphosphatase-2 (FBPase-2) regulate the levels of fructose-2,6-bisphosphate, a key regulator of glycolysis and gluconeogenesis.

Question 14

Which of the following best explains why phosphoenolpyruvate (PEP) can transfer its phosphate group to ADP to form ATP?

Accepted Answer

PEP has a much higher phosphoryl transfer potential than ATP, making the reaction highly exergonic.

Question 15

During the catabolism of storage polysaccharides such as glycogen, which enzyme catalyzes the release of glucose-1-phosphate?

Accepted Answer

Glycogen phosphorylase

Question 16

Which of the following is a correct description of a redox reaction in cellular metabolism?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 17

Which of the following best explains why bread rises during fermentation?

Accepted Answer

Yeast cells produce carbon dioxide during alcoholic fermentation, which forms bubbles in the dough.

Question 18

Which of the following is the correct balanced equation for glycolysis?

Accepted Answer

$$	ext{glucose} + 2NAD^+ + 2ADP + 2P_i ightarrow 2	ext{pyruvate} + 2NADH + 2H^+ + 2ATP$$

Question 19

A runner experiences muscle fatigue during a sprint due to the accumulation of which metabolic product?

Accepted Answer

Lactate

Chemotrophic Energy Metabolism: Glycolysis and Fermentation

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