Question 1

Which of the following best describes the main purpose of the electron transport chain in cellular respiration?

Accepted Answer

To generate a proton gradient that drives ATP synthesis via ATP synthase

Question 2

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

Accepted Answer

$2$

Question 3

Which molecule acts as the final electron acceptor in the mitochondrial electron transport chain?

Accepted Answer

O_2

Question 4

What is the main function of the Krebs cycle in cellular respiration?

Accepted Answer

To generate NADH and FADH_2 for the electron transport chain

Question 5

Which of the following processes occurs in the cytosol of the cell?

Accepted Answer

Glycolysis

Question 6

In photosynthesis, what is the primary role of water in the light reactions?

Accepted Answer

To provide electrons to replace those lost by chlorophyll

Question 7

Which of the following best explains why the inner mitochondrial membrane is folded into cristae?

Accepted Answer

To increase the surface area for the electron transport chain and ATP synthase

Question 8

If a poison blocks the function of ATP synthase, which of the following would be the most immediate effect?

Accepted Answer

ATP production by oxidative phosphorylation would stop

Question 9

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 10

Which process in cellular respiration produces the most ATP?

Accepted Answer

Electron transport chain and ATP synthase

Question 11

A mutation prevents the formation of NADH during glycolysis. Which of the following would be the most direct consequence?

Accepted Answer

The electron transport chain would receive fewer electrons, reducing ATP yield

Question 12

Which of the following is a product of the Calvin cycle in photosynthesis?

Accepted Answer

Glucose (or G3P)

Question 13

Which step of cellular respiration is responsible for the release of the most carbon dioxide?

Accepted Answer

Krebs cycle

Question 14

In the electron transport chain, what is the main consequence of inhibiting the proton pumps?

Accepted Answer

ATP synthase would not function efficiently

Question 15

Which of the following best describes the relationship between the light reactions and the Calvin cycle in photosynthesis?

Accepted Answer

The light reactions provide ATP and NADPH for the Calvin cycle

Question 16

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

Accepted Answer

Glucose

Question 17

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

Accepted Answer

Glycolysis

Question 18

Which of the following best explains why plants need mitochondria?

Accepted Answer

To generate ATP from glucose during cellular respiration

Question 19

Which of the following statements about ATP synthase is correct?

Accepted Answer

It uses the energy of a proton gradient to synthesize ATP from ADP and $P_i$

Question 20

Which of the following is the correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis $\rightarrow$ Krebs cycle $\rightarrow$ Electron transport chain

Cellular Respiration and Photosynthesis: Key Processes in Microbial Metabolism

Study Guide - Practice Questions