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

Question 1

Which of the following best describes chemiosmosis in cellular respiration?

Accepted Answer

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

Question 2

During which process is alcohol produced by yeast cells?

Accepted Answer

Alcoholic fermentation

Question 3

Which of the following is oxidized during cellular respiration?

Accepted Answer

Glucose

Question 4

What is the main purpose of the citric acid cycle in cellular respiration?

Accepted Answer

To produce NADH and FADH$$_2$$ for the electron transport chain

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 of the following statements about photosynthesis is correct?

Accepted Answer

Oxygen is released during the light-dependent reactions.

Question 7

Which wavelengths of light are most efficiently absorbed by chlorophyll for photosynthesis?

Accepted Answer

Red and blue

Question 8

What is the role of NADPH in photosynthesis?

Accepted Answer

It acts as an electron donor in the Calvin cycle.

Question 9

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 10

Which process occurs in the thylakoid membrane of chloroplasts?

Accepted Answer

Light-dependent reactions

Question 11

How does photorespiration affect the efficiency of photosynthesis in C$$_3$$ plants?

Accepted Answer

It decreases the efficiency by consuming oxygen and releasing CO$$_2$$ without producing ATP or sugar.

Question 12

Which of the following is a key evolutionary advantage of C$$_4$$ and CAM plants over C$$_3$$ plants?

Accepted Answer

They minimize photorespiration by separating carbon fixation from the Calvin cycle.

Question 13

Which of the following is reduced during cellular respiration?

Accepted Answer

Oxygen

Question 14

Which step in cellular respiration produces the most ATP?

Accepted Answer

Electron transport chain and chemiosmosis

Question 15

What is the main function of the Calvin cycle in photosynthesis?

Accepted Answer

To fix carbon dioxide into organic molecules

Question 16

Which of the following equations represents the light-dependent reactions of photosynthesis?

Accepted Answer

$$2H_2O + 2NADP^+ + 3ADP + 3P_i + 2H^+ + 2e^- \rightarrow O_2$ + 2NADPH + 3ATP$$

Question 17

Which of the following is a product of anaerobic respiration in muscle cells?

Accepted Answer

Lactic acid

Question 18

Which process allows pyruvate to enter the mitochondrion for further breakdown?

Accepted Answer

Active transport across the mitochondrial membrane

Question 19

How does stomatal closure affect photosynthesis?

Accepted Answer

It decreases CO$$_2$$ uptake, reducing photosynthetic rate.

Question 20

Which of the following best explains why fermentation is necessary in the absence of oxygen?

Accepted Answer

It allows glycolysis to continue by regenerating NAD$$^+.$$

Cellular Respiration and Photosynthesis: Key Concepts and Processes

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