Multiple Choice
Which of the following statements about photosynthesis is correct?
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9. Photosynthesis
Introduction to Photosynthesis
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Which of the following best describes the primary function of the light-dependent reactions of photosynthesis?
A
To produce oxygen by splitting carbon dioxide
B
To break down glucose into pyruvate
C
To fix carbon dioxide into glucose
D
To convert solar energy into chemical energy in the form of ATP and NADPH
Verified step by step guidance1
Understand that photosynthesis occurs in two main stages: the light-dependent reactions and the Calvin cycle (light-independent reactions). The light-dependent reactions take place in the thylakoid membranes of the chloroplasts.
Recognize that the primary purpose of the light-dependent reactions is to capture solar energy and convert it into chemical energy. This energy is stored in the form of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).
Recall that during the light-dependent reactions, chlorophyll absorbs light energy, which excites electrons. These high-energy electrons are passed through the electron transport chain, generating ATP via photophosphorylation and reducing NADP⁺ to NADPH.
Note that water molecules are split during the light-dependent reactions in a process called photolysis. This releases oxygen (O₂) as a byproduct and provides electrons to replace those lost by chlorophyll.
Conclude that the ATP and NADPH produced in the light-dependent reactions are then used in the Calvin cycle to fix carbon dioxide into glucose, but the light-dependent reactions themselves do not directly produce glucose.
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