2024 ATI RN Life Science Fall 2023 Lab Exam 1
Updated 2024 Best Studying Material with All
Questions, Answers, and Rationale
Question 1:
Which of the following is NOT a product of the light reaction?
A. carbon dioxide
B. NADPH
C. ATP
D. oxygen
Show correct answer and explanation
Explanation
Choice A rationale: Carbon dioxide is not a product of the light reaction, but a
reactant of the dark reaction. The light reaction does not use carbon dioxide, but
water and light energy to produce ATP, NADPH, and oxygen¹.
Choice B rationale: NADPH is a product of the light reaction. It is an electron
carrier that is reduced by the electrons from water in photosystem I. NADPH
provides electrons and hydrogen for the dark reaction².
Choice C rationale: ATP is a product of the light reaction. It is an energy molecule
that is synthesized by the enzyme ATP synthase using the proton gradient
created by the electron transport chain. ATP provides energy for the dark
reaction³
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