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

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

Question 1

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

Accepted Answer

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

Question 2

During glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$2$

Question 3

Which stage of cellular respiration occurs in the cytosol of eukaryotic cells?

Accepted Answer

Glycolysis

Question 4

What is the primary role of oxygen in cellular respiration?

Accepted Answer

It acts as the final electron acceptor in the electron transport chain.

Question 5

Which molecule is produced during pyruvate oxidation and enters the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 6

In the electron transport chain, what is the main function of the protein complexes?

Accepted Answer

To pump protons (H$^+$) into the intermembrane space, creating a gradient

Question 7

Which process produces the most ATP per molecule of glucose during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 8

If a cell is deprived of oxygen, which process will continue to produce ATP?

Accepted Answer

Glycolysis

Question 9

What is the net ATP yield from one molecule of glucose after complete aerobic respiration?

Accepted Answer

$30$-$32$

Question 10

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate

Question 11

A researcher finds that mitochondria are most active at pH 5. What does this suggest about the concentration of H$^+$ ions in the intermembrane space?

Accepted Answer

The intermembrane space has a high concentration of H$^+$ ions.

Question 12

Which enzyme is directly responsible for synthesizing ATP during chemiosmosis?

Accepted Answer

ATP synthase

Question 13

During strenuous exercise, muscle cells may switch to lactic acid fermentation. What is a possible consequence of this switch?

Accepted Answer

Lowered blood pH due to lactate accumulation

Question 14

Which of the following is NOT a final electron acceptor in anaerobic respiration?

Accepted Answer

Oxygen

Question 15

What is the main purpose of the citric acid cycle in cellular respiration?

Accepted Answer

To transfer electrons to NAD$^+$ and FAD, forming NADH and FADH$_2$

Question 16

Which of the following best explains why cristae are important in mitochondria?

Accepted Answer

They increase the surface area for electron transport chain reactions.

Question 17

Which process is responsible for recycling NAD$^+$ during fermentation?

Accepted Answer

Reduction of pyruvate to lactate or ethanol

Question 18

A fish caught and held out of water cannot take in oxygen. Which stage of cellular respiration is directly affected?

Accepted Answer

Electron transport chain

Question 19

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

Accepted Answer

It occurs during glycolysis and the citric acid cycle.

Question 20

Which of the following is a correct sequence of electron flow during aerobic cellular respiration?

Accepted Answer

Glucose $\rightarrow$ NADH $\rightarrow$ Electron Transport Chain $\rightarrow$ Oxygen

Cellular Respiration: Structure, Function, and Pathways

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