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

Question 1

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic cellular respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 2

During glycolysis, glucose is converted into which molecule before entering the mitochondria for further processing?

Accepted Answer

Pyruvate

Question 3

Which of the following best describes the role of NADPH in photosynthesis?

Accepted Answer

It acts as an electron donor in the Calvin cycle.

Question 4

A mutation blocks the function of Photosystem II in a plant. Which process would be directly affected?

Accepted Answer

Splitting of water ($$H_2O) $$and release of oxygen ($$O_2)$$

Question 5

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 6

Which process occurs in the thylakoid membrane of the chloroplast?

Accepted Answer

Light-dependent reactions of photosynthesis

Question 7

If a toxin blocks the ATP synthase in mitochondria, which immediate effect would you expect in a cell?

Accepted Answer

Decrease in ATP production

Question 8

Which molecule is produced during the light-independent reactions of photosynthesis?

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 9

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

Accepted Answer

Oxaloacetate

Question 10

Which of the following is a direct product of the electron transport chain in mitochondria?

Accepted Answer

Water ($$H_2O)$$

Question 11

A plant is exposed to a bacterial toxin that blocks electron transport in the thylakoid membrane. What is the most likely consequence?

Accepted Answer

ATP and NADPH production will decrease, impairing the Calvin cycle.

Question 12

Which of the following best explains why plants need both photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases it for cellular work.

Question 13

Which of the following is NOT a product of glycolysis?

Accepted Answer

FADH$$_2$$

Question 14

During the Calvin cycle, which molecule is used as the carbon source for glucose synthesis?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 15

Which process is responsible for the majority of ATP production in aerobic respiration?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 16

If a cell lacks mitochondria, which process can it still perform to generate ATP?

Accepted Answer

Glycolysis

Question 17

Which of the following statements about the light-dependent reactions of photosynthesis is correct?

Accepted Answer

They generate ATP and NADPH for use in the Calvin cycle.

Question 18

Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?

Accepted Answer

Rubisco

Question 19

A cell is exposed to cyanide, which inhibits cytochrome c oxidase in the electron transport chain. What is the immediate effect?

Accepted Answer

ATP synthesis stops due to blocked electron flow.

Question 20

Which of the following correctly matches the location with the process?

Accepted Answer

Citric acid cycle — Mitochondrial matrix

Cellular Respiration and Photosynthesis: Key Concepts and Processes (Chapters 7-8)

Study Guide - Practice Questions