Multiple Choice
Which color of visible light is most effective in driving the light reactions of photosynthesis in green plants?
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9. Photosynthesis
Light Reactions of Photosynthesis
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Which of the following best lists the end products of the light-dependent reactions of photosynthesis?
A
Glucose, NADPH, and O$_2$
B
ATP, NADPH, and O$_2$
C
Glucose, ATP, and CO$_2$
D
NADH, FADH$_2$, and O$_2$
Verified step by step guidance1
Understand that the light-dependent reactions of photosynthesis occur in the thylakoid membranes of chloroplasts and are responsible for converting light energy into chemical energy.
Recall that the primary products of the light-dependent reactions are ATP (energy currency), NADPH (electron carrier), and O$_2$ (a byproduct of water splitting).
Eliminate incorrect options by identifying that glucose and CO$_2$ are not direct products of the light-dependent reactions. Glucose is produced in the Calvin cycle (light-independent reactions), and CO$_2$ is a reactant in the Calvin cycle, not a product.
Recognize that NADH and FADH$_2$ are electron carriers used in cellular respiration, not photosynthesis, so any option listing them is incorrect.
Conclude that the correct answer is ATP, NADPH, and O$_2$, as these are the direct end products of the light-dependent reactions of photosynthesis.
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