Q: Which equation correctly represents the overall reaction for aerobic cellular respiration?

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

Question 1

Which of the following best describes the role of oxygen in cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, forming water.

Question 2

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

Accepted Answer

$2$ ATP and $2$ NADH

Question 3

Which process in cellular respiration produces the majority of ATP?

Accepted Answer

Oxidative phosphorylation (electron transport and chemiosmosis)

Question 4

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which cellular process will be most directly affected?

Accepted Answer

Chemiosmosis during oxidative phosphorylation

Question 5

Which equation correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

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

Question 6

In the citric acid cycle, which molecule combines with acetyl CoA to form citrate?

Accepted Answer

Oxaloacetate

Question 7

Which statement best explains why fats yield more ATP per gram than carbohydrates?

Accepted Answer

Fats have more hydrogen atoms, providing more electrons for the electron transport chain.

Question 8

Which of the following is TRUE about substrate-level phosphorylation?

Accepted Answer

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

Question 9

A yeast cell is placed in an anaerobic environment. Which metabolic pathway will allow it to continue producing ATP?

Accepted Answer

Alcohol fermentation

Question 10

Which molecule acts as the oxidizing agent during glycolysis?

Accepted Answer

NAD+

Question 11

During lactic acid fermentation, what is the final electron acceptor?

Accepted Answer

Pyruvate

Question 12

Which of the following best describes chemiosmosis?

Accepted Answer

The use of a proton gradient to drive ATP synthesis via ATP synthase.

Question 13

If a cell's electron transport chain is blocked, which process will continue to produce ATP?

Accepted Answer

Substrate-level phosphorylation in glycolysis

Question 14

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

Accepted Answer

Glucose $\rightarrow$ NADH $\rightarrow$ Electron transport chain $\rightarrow$ Proton-motive force $\rightarrow$ ATP

Question 15

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ by transferring electrons to organic molecules.

Question 16

A mutation prevents the formation of oxaloacetate in a cell. Which process will be directly disrupted?

Accepted Answer

Citric acid cycle (Krebs cycle)

Question 17

Which of the following is NOT a product of the citric acid cycle per glucose molecule?

Accepted Answer

4 Pyruvate

Question 18

Why is glycolysis considered to be one of the most ancient metabolic pathways?

Accepted Answer

It occurs in the cytosol and does not require oxygen.

Question 19

Which of the following statements about obligate anaerobes is correct?

Accepted Answer

They use only fermentation or anaerobic respiration and cannot survive in the presence of oxygen.

Question 20

A cell is metabolizing a fatty acid through beta oxidation. What is the immediate product that enters the citric acid cycle?

Accepted Answer

Acetyl CoA

Cellular Respiration and Fermentation: Key Concepts and Processes

Study Guide - Practice Questions

Study Guide - Flashcards