$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}$$

Question 1

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

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy (ATP)}$$

Question 2

Where in the plant cell does the Krebs cycle occur?

Accepted Answer

Mitochondrial matrix

Question 3

Which process is responsible for the majority of ATP production during cellular respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 4

A scientist wants to measure the rate of respiration in a plant using a respirometer. What modification must be made to ensure accurate results?

Accepted Answer

Place the apparatus in the dark to prevent photosynthesis

Question 5

Which of the following is a product of the Krebs cycle that directly donates electrons to the electron transport chain?

Accepted Answer

NADH

Question 6

During glycolysis, one molecule of glucose is converted into:

Accepted Answer

Two molecules of pyruvate

Question 7

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

Accepted Answer

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

Question 8

If a plant cell is deprived of oxygen, which process will allow it to continue producing ATP, albeit less efficiently?

Accepted Answer

Fermentation

Question 9

How many net ATP molecules are produced from one molecule of glucose during glycolysis?

Accepted Answer

$$2$$

Question 10

Which of the following statements correctly compares photosynthesis and cellular respiration?

Accepted Answer

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

Question 11

What is the main purpose of the proton gradient established by the electron transport chain?

Accepted Answer

To drive the production of ATP via ATP synthase

Question 12

Which molecule is regenerated during fermentation to allow glycolysis to continue in the absence of oxygen?

Accepted Answer

NAD$$^+$$

Question 13

A mutation disables ATP synthase in a plant cell. Which of the following would be the most immediate consequence?

Accepted Answer

The cell would be unable to produce ATP via oxidative phosphorylation

Question 14

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

Accepted Answer

Glucose

Question 15

If a toxin blocks the transfer of electrons from NADH to the electron transport chain, what will be the effect on ATP production?

Accepted Answer

ATP production will decrease significantly

Question 16

Which step of cellular respiration produces the most NADH?

Accepted Answer

Krebs cycle

Question 17

A plant is exposed to cyanide, which inhibits cytochrome c oxidase in the electron transport chain. What is the most likely outcome?

Accepted Answer

Electron flow through the ETC will stop, halting ATP production by oxidative phosphorylation

Question 18

Which of the following best explains the relationship between the Calvin cycle and the Krebs cycle?

Accepted Answer

The Calvin cycle fixes carbon during photosynthesis, while the Krebs cycle releases carbon as CO$$_2$$ during respiration

Question 19

Calculate the total number of ATP molecules produced from one molecule of glucose during aerobic respiration in plants.

Accepted Answer

$$38$$

Question 20

Which of the following is a consequence of oxygen deprivation in plant cells?

Accepted Answer

Switch to fermentation, resulting in less ATP production

Plant Cellular Respiration: Pathways, Mechanisms, and Energy Yield

Study Guide - Practice Questions