Q: Which of the following best describes the overall chemical equation for aerobic cellular respiration?

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

Question 1

Which of the following best describes the overall chemical equation for aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}}$$

Question 2

During which stage of aerobic cellular respiration is the majority of ATP produced?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 3

Which molecule acts as the final electron acceptor in the electron transport chain of aerobic respiration?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 4

How many net ATP molecules are produced directly from glycolysis per molecule of glucose?

Accepted Answer

2

Question 5

If a poison blocks ATP synthase in mitochondria, which process would be directly inhibited?

Accepted Answer

Chemiosmosis

Question 6

In the citric acid cycle, what is the fate of the carbons from acetyl CoA?

Accepted Answer

They are released as $$\mathrm{CO_2$}$$

Question 7

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD$$^+ so $$glycolysis can continue in the absence of oxygen.

Question 8

A muscle cell is deprived of oxygen. Which of the following will most likely occur?

Accepted Answer

The cell will switch to lactic acid fermentation, producing lactate and 2 ATP per glucose.

Question 9

How many NADH molecules are produced from one glucose molecule during the citric acid cycle (including both turns for each acetyl CoA)?

Accepted Answer

6

Question 10

Which of the following best explains why FADH$$_2$$ produces fewer ATP molecules than NADH when donating electrons to the electron transport chain?

Accepted Answer

FADH$$_2$$ donates electrons at a later point in the chain, resulting in fewer protons pumped and less ATP generated.

Question 11

Which enzyme is responsible for synthesizing ATP as protons flow back into the mitochondrial matrix?

Accepted Answer

ATP synthase

Question 12

If a mutation caused the inner mitochondrial membrane to become permeable to protons, what would be the most immediate effect on cellular respiration?

Accepted Answer

ATP production by oxidative phosphorylation would decrease.

Question 13

Which of the following is a direct product of glycolysis that enters the mitochondrion for further oxidation?

Accepted Answer

Pyruvate

Question 14

In yeast fermentation, what is the final electron acceptor that allows NAD$$^+$$ regeneration?

Accepted Answer

Acetaldehyde

Question 15

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

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

Question 16

A patient is diagnosed with a genetic disorder that prevents the formation of oxaloacetate. Which process would be directly affected?

Accepted Answer

The citric acid cycle would be disrupted, preventing acetyl CoA from entering the cycle.

Question 17

Which feedback mechanism is most important in regulating the rate of glycolysis in response to cellular energy needs?

Accepted Answer

Allosteric inhibition of phosphofructokinase by ATP

Question 18

How many total ATP molecules are produced from the complete aerobic breakdown of one glucose molecule (including substrate-level and oxidative phosphorylation)?

Accepted Answer

About 32

Question 19

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

Accepted Answer

Glycolysis does not require oxygen and occurs in the cytosol.

Question 20

A yeast cell is growing in an environment with no oxygen. Which of the following products will accumulate as a result of fermentation?

Accepted Answer

Ethanol and CO$$_2$$

Aerobic Cellular Respiration and Fermentation: Pathways of Energy Production

Study Guide - Practice Questions

Study Guide - Flashcards