Multiple Choice
One stage of photosynthesis occurs in the membrane of which structure within a chloroplast?
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9. Photosynthesis
Light Reactions of Photosynthesis
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Which of the following molecules is the primary product of Photosystem I during the light reactions of photosynthesis?
A
Glucose
B
NADPH
C
ATP
D
O\(_2\)
Verified step by step guidance1
Step 1: Begin by understanding the role of Photosystem I in the light reactions of photosynthesis. Photosystem I is primarily involved in the production of high-energy molecules that are used in the Calvin cycle.
Step 2: Recall that Photosystem I uses light energy to excite electrons, which are then transferred through a series of proteins in the electron transport chain.
Step 3: Recognize that the primary product of Photosystem I is NADPH, a molecule that acts as an electron carrier and provides reducing power for the Calvin cycle. This is distinct from ATP, which is produced by ATP synthase, and O\(_2\), which is a byproduct of Photosystem II.
Step 4: Eliminate incorrect options such as glucose, which is synthesized later in the Calvin cycle, and O\(_2\), which is generated by Photosystem II during the splitting of water molecules.
Step 5: Conclude that the correct answer is NADPH, as it is the molecule directly produced by Photosystem I during the light reactions of photosynthesis.
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