Question 1

Which of the following best represents the overall chemical equation for oxygenic photosynthesis?

Accepted Answer

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

Question 2

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

Accepted Answer

Thylakoid membrane

Question 3

What is the primary function of the light-dependent reactions in photosynthesis?

Accepted Answer

To capture energy from sunlight and produce ATP and NADPH

Question 4

Which scientist first identified water as the source of oxygen released during photosynthesis?

Accepted Answer

C. B. van Niel

Question 5

What is the role of accessory pigments in photosynthesis?

Accepted Answer

They absorb light wavelengths not absorbed by chlorophyll a, increasing the range of usable light.

Question 6

Which pigment is the primary pigment in plants and cyanobacteria, and what wavelengths does it absorb?

Accepted Answer

Chlorophyll a; absorbs violet-blue and red light

Question 7

What is the significance of the porphyrin ring in chlorophyll molecules?

Accepted Answer

It contains a magnesium ion and allows photons to excite electrons for transfer.

Question 8

Which of the following best describes the function of carotenoids in plant leaves?

Accepted Answer

They absorb photons with a wide range of energies and act as antioxidants.

Question 9

In the organization of a photosystem, what is the role of the antenna complex?

Accepted Answer

To transfer energy from absorbed photons to the reaction center

Question 10

What happens to the electron in chlorophyll a at the reaction center when it absorbs energy from the antenna complex?

Accepted Answer

It becomes excited and is transferred to an electron acceptor

Question 11

Which of the following is NOT a stage of the light-dependent reactions?

Accepted Answer

Carbon fixation

Question 12

In sulfur bacteria, which process is used to generate ATP during photosynthesis?

Accepted Answer

Cyclic photophosphorylation

Question 13

Photosystem I and II are involved in which process in chloroplasts?

Accepted Answer

Noncyclic photophosphorylation

Question 14

Which photosystem has a reaction center pigment with a peak absorption at 700 nm?

Accepted Answer

Photosystem I

Question 15

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

Accepted Answer

To use ATP and NADPH to synthesize organic molecules from $$CO_2$$

Question 16

Which of the following statements about photons is correct?

Accepted Answer

The energy content of a photon is inversely proportional to its wavelength.

Question 17

What is the photoelectric effect as it relates to photosynthesis?

Accepted Answer

The removal of an electron from a molecule by light

Question 18

Which pigment is responsible for absorbing light wavelengths that chlorophyll a does not absorb?

Accepted Answer

Chlorophyll b

Question 19

Why do leaves appear red in autumn, as seen in the oak leaf example?

Accepted Answer

Carotenoids remain after chlorophyll degrades, reflecting red and orange light.

Question 20

Which of the following best describes the absorption spectrum of chlorophyll a?

Accepted Answer

It shows high absorption in the violet-blue and red regions of the visible spectrum.

Photosynthesis: Structure, Function, and Mechanisms

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