The reaction center of photosystem has:
Correct answer: C. One or more molecules of chlorophyll a and the primary electron acceptor
- A. One molecule of chlorophyll a and a primary electron acceptor
- B. Many molecules of chlorophyll a and primary electron acceptor
- C. One or more molecules of chlorophyll a and the primary electron acceptor
- D. Chlorophyll a, chlorophyll b, and the primary electron acceptor
Explanation
The reaction center of a photosystem is crucial for the initial steps of photosynthesis. It consists of one or more molecules of chlorophyll a, which are responsible for capturing light energy, and a primary electron acceptor that facilitates the transfer of electrons. Option C correctly identifies these components. Option A is incorrect, as it suggests only one molecule of chlorophyll a, whereas the center can have multiple such molecules. Option B is misleading, as it suggests an unspecified large number. Option D incorrectly includes chlorophyll b, which is not part of the reaction center but is involved in light harvesting.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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