Multiple Choice
In the context of organic chemistry reactions, how does substrate concentration affect enzyme activity?
3. Acids and Bases
Organic Chemistry Reactions
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Which of the following reactions is characteristic of the light reactions in photosynthesis?
A
Oxidation of water to release oxygen
B
Fixation of carbon dioxide into glucose
C
Conversion of glucose to pyruvate
D
Reduction of NADP+ to NADPH
Verified step by step guidance1
Understand the context of photosynthesis: Photosynthesis consists of two main stages, the light reactions and the Calvin cycle. The light reactions occur in the thylakoid membranes of chloroplasts and are responsible for converting light energy into chemical energy.
Identify the key processes in the light reactions: The light reactions involve the absorption of light by chlorophyll, leading to the generation of ATP and NADPH, and the splitting of water molecules (photolysis) to release oxygen.
Examine the options given: The question provides four options related to photosynthesis. We need to determine which one is characteristic of the light reactions.
Analyze each option:
- Oxidation of water to release oxygen: This is a key process in the light reactions where water is split to release oxygen, electrons, and protons.
- Fixation of carbon dioxide into glucose: This occurs in the Calvin cycle, not the light reactions.
- Conversion of glucose to pyruvate: This is part of cellular respiration, not photosynthesis.
- Reduction of NADP+ to NADPH: This occurs during the light reactions as electrons are transferred to NADP+.
Conclude which option is characteristic of the light reactions: Based on the analysis, the oxidation of water to release oxygen is a characteristic process of the light reactions in photosynthesis.
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