Question 1

Which of the following best describes the role of NAD+ in cellular respiration?

Accepted Answer

NAD+ functions as an electron carrier, accepting electrons during glycolysis and the Krebs cycle.

Question 2

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

Accepted Answer

$$2$$

Question 3

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 4

In the light-dependent reactions of photosynthesis, what is the primary function of water?

Accepted Answer

Water donates electrons to replace those lost by chlorophyll in photosystem II.

Question 5

Which molecule is produced during fermentation in muscle cells under anaerobic conditions?

Accepted Answer

Lactic acid

Question 6

What is the main purpose of the electron transport chain in mitochondria?

Accepted Answer

To generate a proton gradient that drives ATP synthesis

Question 7

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

Accepted Answer

Glucose

Question 8

If a plant is exposed to light but deprived of CO$$_2$$, which process will be directly affected?

Accepted Answer

Calvin cycle

Question 9

Which of the following best explains why oxygen is required for aerobic cellular respiration?

Accepted Answer

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

Question 10

During the Krebs cycle, which molecule is regenerated to allow the cycle to continue?

Accepted Answer

Oxaloacetate

Question 11

Which process occurs in the cytoplasm of the cell?

Accepted Answer

Glycolysis

Question 12

What is the main difference between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration produces more ATP per glucose molecule than anaerobic respiration.

Question 13

Which of the following is a direct product of glycolysis?

Accepted Answer

Pyruvate

Question 14

In photosynthesis, what is the source of electrons for the electron transport chain in the thylakoid membrane?

Accepted Answer

Water ($$H_2O)$$

Question 15

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases energy from glucose.

Question 16

A patient is experiencing muscle fatigue after intense exercise. Which metabolic process is most likely responsible for the buildup of lactic acid?

Accepted Answer

Fermentation

Question 17

Which of the following equations represents the net reaction of alcoholic fermentation?

Accepted Answer

$$C_6H_{12}O_6$ \rightarrow 2C_2H_5OH + 2CO_2$$

Question 18

Which molecule is reduced during the light-dependent reactions of photosynthesis?

Accepted Answer

NADP+

Question 19

If the electron transport chain in mitochondria is inhibited, which of the following will most likely occur?

Accepted Answer

ATP production will decrease significantly.

Question 20

Which of the following is true about the ATP yield from one molecule of glucose during aerobic respiration?

Accepted Answer

Approximately $$36 to$$ $$38$$ ATP molecules are produced.

Cellular Respiration and Photosynthesis: Key Concepts and Pathways

Study Guide - Practice Questions