Q: Which equation correctly represents alcoholic fermentation?

$$\text{pyruvic acid} + \text{NADH} \rightarrow \text{ethyl alcohol} + \text{CO}_2 + \text{NAD}^+$$

Q: Which of the following equations represents cellular respiration?

$$6\text{O}_2 + \text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{energy (ATP)}$$

Question 1

Which of the following best describes the main difference between breathing and cellular respiration?

Accepted Answer

Breathing is a physical process that brings gases into the body, while cellular respiration is a chemical process that releases energy from food.

Question 2

Which compartment of the mitochondrion contains the enzymes for the Krebs cycle?

Accepted Answer

Matrix

Question 3

What is the primary function of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They transport high-energy electrons to the electron transport chain.

Question 4

Which equation correctly represents alcoholic fermentation?

Accepted Answer

$$	ext{pyruvic acid} + 	ext{NADH} ightarrow 	ext{ethyl alcohol} + 	ext{CO}_2 + 	ext{NAD}^+$$

Question 5

During intense exercise, why do muscle cells switch to lactic acid fermentation?

Accepted Answer

Because oxygen supply is insufficient, so cells regenerate NAD$$^+ to $$continue glycolysis.

Question 6

Which of the following is a major advantage of aerobic respiration over anaerobic respiration?

Accepted Answer

It releases much more energy per glucose molecule.

Question 7

What is the net ATP yield from one molecule of glucose during anaerobic respiration (fermentation)?

Accepted Answer

2 ATP

Question 8

Which of the following best explains why yeast is used in bread making?

Accepted Answer

Yeast performs alcoholic fermentation, releasing CO$$_2$$ that causes the dough to rise.

Question 9

Which of the following equations represents cellular respiration?

Accepted Answer

$$6	ext{O}_2 + 	ext{C}_6	ext{H}_{12}	ext{O}_6 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{energy (ATP)}$$

Question 10

A patient is experiencing muscle pain after sprinting. Which process is most likely responsible for this pain?

Accepted Answer

Lactic acid fermentation due to insufficient oxygen

Question 11

Which of the following statements about the relationship between photosynthesis and cellular respiration is correct?

Accepted Answer

Cellular respiration uses oxygen and glucose to produce carbon dioxide, water, and ATP.

Question 12

Which of the following is a correct comparison between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration produces up to 38 ATP per glucose, while anaerobic respiration produces only 2 ATP per glucose.

Question 13

Which molecule is regenerated during fermentation to allow glycolysis to continue?

Accepted Answer

NAD$$^+$$

Question 14

A scientist is studying bacteria that live in deep ocean vents where no oxygen is present. Which process do these bacteria most likely use to generate ATP?

Accepted Answer

Anaerobic respiration (fermentation)

Question 15

Which of the following is a waste product of aerobic respiration that is exhaled by animals?

Accepted Answer

Carbon dioxide

Question 16

Which of the following best explains why lactic acid fermentation is important during short bursts of intense exercise?

Accepted Answer

It allows glycolysis to continue producing ATP when oxygen is scarce.

Question 17

Which of the following is NOT a product of the Krebs cycle?

Accepted Answer

Glucose

Question 18

Which process occurs in the cytosol and does not require oxygen?

Accepted Answer

Glycolysis

Question 19

A baker wants to maximize the amount of carbon dioxide produced by yeast in dough. Which condition should be provided?

Accepted Answer

Low oxygen levels to promote alcoholic fermentation

Question 20

Which of the following best describes the role of pyruvic acid in cellular respiration?

Accepted Answer

It is produced during glycolysis and can enter either aerobic or anaerobic pathways.

Cellular Respiration and Fermentation: Mechanisms of Energy Release in Cells

Study Guide - Practice Questions

Study Guide - Flashcards