Question 1

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

Accepted Answer

It uses solar energy to convert inorganic molecules into organic molecules.

Question 2

During the light reactions of photosynthesis, which molecule acts as the final electron acceptor?

Accepted Answer

NADP\^+

Question 3

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

$6CO\_2 + 6H\_2O \rightarrow C\_6H\_{12}O\_6 + 6O\_2$

Question 4

Which structure within the chloroplast is the site of the light-dependent reactions?

Accepted Answer

Thylakoid membrane

Question 5

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

Accepted Answer

To fix carbon dioxide and produce sugars

Question 6

Which of the following statements about chemiosmosis in photosynthesis is correct?

Accepted Answer

Chemiosmosis uses a proton gradient to drive ATP synthesis in the thylakoid membrane.

Question 7

Which color of visible light has the shortest wavelength and the highest energy?

Accepted Answer

Violet

Question 8

Why does the absorption spectrum of chlorophyll a alone underestimate the effectiveness of certain wavelengths in driving photosynthesis?

Accepted Answer

Because accessory pigments absorb additional wavelengths and transfer energy to chlorophyll a.

Question 9

In the linear electron flow of photosynthesis, what is the source of electrons for Photosystem II?

Accepted Answer

Water ($H\_2O$)

Question 10

Which enzyme is responsible for carbon fixation in the Calvin cycle?

Accepted Answer

Rubisco

Question 11

How many turns of the Calvin cycle are required to produce one molecule of G3P?

Accepted Answer

Three

Question 12

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose

Question 13

What is the main purpose of the proton gradient generated during the light reactions?

Accepted Answer

To drive the synthesis of ATP via ATP synthase

Question 14

Which molecule is regenerated at the end of the Calvin cycle to allow the cycle to continue?

Accepted Answer

RuBP

Question 15

If a plant is exposed only to green light, what would happen to its rate of photosynthesis?

Accepted Answer

It would decrease because chlorophyll reflects green light.

Question 16

Which of the following best explains why oxygen is released during photosynthesis?

Accepted Answer

Oxygen is released when water is split during the light reactions.

Question 17

Which of the following is a correct comparison between chemiosmosis in photosynthesis and cellular respiration?

Accepted Answer

Both use a proton gradient to drive ATP synthesis, but in photosynthesis the gradient is across the thylakoid membrane, while in respiration it is across the inner mitochondrial membrane.

Question 18

Which of the following is the correct sequence of events in the light reactions?

Accepted Answer

Splitting of water, absorption of light by Photosystem II, electron transport, ATP synthesis

Question 19

How many molecules of ATP and NADPH are required to produce one molecule of G3P in the Calvin cycle?

Accepted Answer

9 ATP and 6 NADPH

Question 20

Which statement best describes the relationship between wavelength and energy in the visible spectrum?

Accepted Answer

Shorter wavelengths have higher energy.

Photosynthesis: Key Concepts and Processes

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