Multiple Choice
Which of the following statements about the light-dependent reactions of photosynthesis is correct?
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9. Photosynthesis
Light Reactions of Photosynthesis
Multiple Choice
Which of the following are the main outputs of the light reactions of photosynthesis?
A
RuBP, ADP, and NADP\(^+\)
B
Pyruvate, FADH\(_2\), and H\(_2\)O
C
Glucose, CO\(_2\), and NADH
D
ATP, NADPH, and O\(_2\)
Verified step by step guidance1
Understand the light reactions of photosynthesis: These occur in the thylakoid membranes of chloroplasts and involve the conversion of light energy into chemical energy.
Identify the main processes in the light reactions: Photons excite electrons in chlorophyll molecules, leading to the splitting of water (H\(_2\)O) into oxygen (O\(_2\)), protons, and electrons. This process is called photolysis.
Recognize the role of the electron transport chain: Excited electrons move through the electron transport chain, creating a proton gradient that drives ATP synthesis via chemiosmosis.
Understand the production of NADPH: Electrons are transferred to NADP\(^+\) at the end of the electron transport chain, forming NADPH, which is used in the Calvin cycle.
Summarize the outputs: The main outputs of the light reactions are ATP (energy currency), NADPH (electron carrier), and O\(_2\) (byproduct of water splitting).
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