Multiple Choice
Plants obtain the majority of the carbon necessary for building structural molecules from:
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9. Photosynthesis
Introduction to Photosynthesis
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Electrons excited in Photosystem II help the chloroplast produce which of the following molecules during the light-dependent reactions of photosynthesis?
A
NADH
B
Glucose
C
O$_2$
D
ATP
Verified step by step guidance1
Understand the role of Photosystem II in the light-dependent reactions of photosynthesis. Photosystem II is responsible for absorbing light energy and exciting electrons, which are then transferred through the electron transport chain.
Recognize that the excited electrons from Photosystem II are used to drive the production of ATP through a process called photophosphorylation. This occurs as the electrons move through the electron transport chain, creating a proton gradient across the thylakoid membrane.
Recall that the proton gradient generated by the movement of electrons powers ATP synthase, an enzyme that synthesizes ATP from ADP and inorganic phosphate (Pi). This process is known as chemiosmosis.
Clarify that NADH and glucose are not produced during the light-dependent reactions. NADPH, not NADH, is produced in the light-dependent reactions, and glucose is synthesized later during the Calvin cycle (light-independent reactions).
Confirm that O$_2$ is a byproduct of Photosystem II, resulting from the splitting of water molecules to replace the excited electrons. However, the molecule directly produced by the energy from excited electrons in Photosystem II is ATP.
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