Question 1

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

Accepted Answer

Photosynthesis converts solar energy into chemical energy, which is then used by cellular respiration to generate ATP.

Question 2

What is the correct balanced equation for cellular respiration, and which molecules are oxidized and reduced?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + 	ext{Energy}$$; glucose is oxidized, O$$_2 is $$reduced.

Question 3

During the light reactions of photosynthesis, what is the primary function of the electron transport chain in the thylakoid membrane?

Accepted Answer

To generate a proton gradient that drives ATP synthesis via chemiosmosis.

Question 4

Which pigment is primarily responsible for the absorption of light energy in photosynthesis, and what wavelengths does it absorb most efficiently?

Accepted Answer

Chlorophyll a; absorbs violet-blue and red light most efficiently.

Question 5

A plant exposed to only green light will likely experience which of the following outcomes?

Accepted Answer

It will photosynthesize at a lower rate because green light is mostly reflected.

Question 6

What is the role of NADP$$^+ in $$the light reactions of photosynthesis?

Accepted Answer

It is reduced to NADPH, which carries high-energy electrons to the Calvin cycle.

Question 7

Which of the following best explains why C4 plants are more efficient than C3 plants in hot, dry climates?

Accepted Answer

C4 plants structurally separate carbon fixation from the Calvin cycle, minimizing photorespiration.

Question 8

In the Calvin cycle, what is the immediate product after carbon fixation, and which enzyme catalyzes this reaction?

Accepted Answer

3-phosphoglycerate; catalyzed by rubisco.

Question 9

Which of the following statements about chemiosmosis in mitochondria and chloroplasts is correct?

Accepted Answer

Mitochondria transfer chemical energy from food to ATP, while chloroplasts transform light energy into ATP.

Question 10

A scientist genetically modifies rice (a C3 plant) to carry out C4 photosynthesis. What is the most likely outcome for rice grown in hot, arid conditions?

Accepted Answer

The rice will have increased yield due to reduced water loss and minimized photorespiration.

Question 11

Which process is directly responsible for the release of oxygen during photosynthesis?

Accepted Answer

Splitting of water molecules during the light reactions.

Question 12

What is the main function of the stomata in plant leaves?

Accepted Answer

To allow the exchange of gases, specifically CO$$_2$$ and O$$_2.$$

Question 13

Which of the following is a real-world consequence of photorespiration in C3 plants?

Accepted Answer

Loss of fixed carbon and decreased efficiency of photosynthesis.

Question 14

Why do CAM plants open their stomata at night?

Accepted Answer

To minimize water loss while allowing CO$$_2$$ uptake.

Question 15

Which molecule acts as the primary electron acceptor in the reaction center of a photosystem?

Accepted Answer

A specialized protein that accepts excited electrons from chlorophyll a

Question 16

What is the main purpose of cyclic electron flow in photosynthesis?

Accepted Answer

To produce ATP without generating NADPH or oxygen.

Question 17

Which of the following best describes the action spectrum for photosynthesis?

Accepted Answer

It is broader than the absorption spectrum of chlorophyll a due to accessory pigments.

Question 18

In the Calvin cycle, how many molecules of ATP and NADPH are required for the net synthesis of one G3P molecule?

Accepted Answer

Nine ATP and six NADPH

Question 19

Which of the following is a key difference between oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts?

Accepted Answer

Photophosphorylation uses light energy to drive ATP synthesis, while oxidative phosphorylation uses energy from organic molecules.

Photosynthesis and Cellular Respiration: Structure, Function, and Mechanisms

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