Q: Which of the following statements about the Z-scheme of photosynthesis is correct?

Electrons flow from water to NADP$^+$ via both PSI and PSII.

Question 1

Which of the following statements about photosynthetic light reactions in plants is TRUE?

Accepted Answer

The energy for electron transport is derived from light.

Question 2

Cyclic electron flow in photosynthesis produces which of the following?

Accepted Answer

ATP only

Question 3

Archaea have rhodopsins that use light to generate which of the following?

Accepted Answer

Proton motive force

Question 4

In the chloroplast membrane, a photosystem contains many chlorophyll molecules. What is the primary role of these molecules?

Accepted Answer

They serve as antenna molecules to transfer energy to the reaction center chlorophyll.

Question 5

A mole of light at 680 nm wavelength contains energy equivalent to which of the following values? (Use $E = \frac{hc}{\lambda}$, $h = 6.626 	imes 10^{-34}$ J·s, $c = 3.00 	imes 10^8$ m/s, $N_A = 6.022 	imes 10^{23}$ mol$^{-1}$)

Accepted Answer

$1.76 	imes 10^5$ J$

Question 6

Which of the following best describes the role of the proton gradient in photosynthetic light reactions?

Accepted Answer

It is used to drive the synthesis of ATP via ATP synthase.

Question 7

Which of the following is NOT a product of the non-cyclic electron flow in photosynthesis?

Accepted Answer

FADH$_2$

Question 8

If the wavelength of light absorbed by chlorophyll is decreased from 700 nm to 400 nm, what happens to the energy of the photons absorbed? (Recall $E = \frac{hc}{\lambda}$)

Accepted Answer

The energy increases.

Question 9

Which of the following statements about the Z-scheme of photosynthesis is correct?

Accepted Answer

Electrons flow from water to NADP$^+$ via both PSI and PSII.

Question 10

Which of the following is a direct consequence of the absorption of light by chlorophyll in the reaction center?

Accepted Answer

Excitation of an electron to a higher energy state

Question 11

Which of the following best explains why cyclic electron flow does not produce NADPH?

Accepted Answer

Electrons are transferred back to the reaction center instead of NADP$^+$.

Question 12

Which of the following is the ultimate source of electrons for the light reactions of photosynthesis?

Accepted Answer

Water (H$_2$O)

Question 13

Which of the following is a unique feature of archaeal rhodopsins compared to plant photosystems?

Accepted Answer

They generate a proton motive force without electron transport chains.

Question 14

Which of the following is a correct description of the antenna complex in photosynthesis?

Accepted Answer

It captures and transfers light energy to the reaction center.

Question 15

Which of the following is a direct product of the light-dependent reactions of photosynthesis?

Accepted Answer

NADPH

Study Notes: Photophosphorylation and Photosynthesis

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