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Multiple Choice
Which of the following molecules is the final electron acceptor for electrons from Photosystem I in the process of photosynthesis?
A
ATP
B
NADP+
C
Water
D
Oxygen
Verified step by step guidance
1
Understand the role of Photosystem I in photosynthesis: Photosystem I is part of the light-dependent reactions in photosynthesis, where it plays a crucial role in the transfer of electrons.
Identify the process of electron transfer: In Photosystem I, electrons are excited by light energy and transferred through a series of proteins embedded in the thylakoid membrane.
Recognize the final electron acceptor: The electrons from Photosystem I are ultimately transferred to NADP+ (Nicotinamide adenine dinucleotide phosphate), reducing it to NADPH.
Clarify the function of NADPH: NADPH is an essential molecule that carries electrons and provides reducing power for the Calvin cycle, where it helps in the synthesis of glucose from carbon dioxide.
Differentiate from other molecules: ATP is an energy carrier, water is a source of electrons in Photosystem II, and oxygen is a byproduct of water splitting, not the final electron acceptor in Photosystem I.