Multiple Choice
Which of the following are produced during the light reactions of photosynthesis?
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9. Photosynthesis
Light Reactions of Photosynthesis
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In the light reactions of photosynthesis, which molecule acts as the final electron acceptor in the electron transport chain?
A
O$_2$
B
NADP$^+$
C
ATP
D
Glucose
Verified step by step guidance1
Understand the context: The light reactions of photosynthesis occur in the thylakoid membranes of chloroplasts. These reactions involve the absorption of light energy, which drives the movement of electrons through the electron transport chain.
Identify the role of the electron transport chain: In the light reactions, electrons are excited by light energy and passed through a series of protein complexes in the thylakoid membrane. This process generates a proton gradient and ultimately transfers electrons to a final acceptor.
Recall the final electron acceptor: In the light reactions, the final electron acceptor is NADP$^+$ (nicotinamide adenine dinucleotide phosphate). It combines with electrons and protons to form NADPH, which is used in the Calvin cycle for carbon fixation.
Eliminate incorrect options: O$_2$ is the final electron acceptor in cellular respiration, not photosynthesis. ATP is synthesized during the light reactions but does not act as an electron acceptor. Glucose is a product of photosynthesis, not involved in the light reactions.
Conclude the answer: The correct molecule acting as the final electron acceptor in the light reactions of photosynthesis is NADP$^+$.
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