The most abundant protein in the chloroplasts is
Correct answer: A. Rubisco
- A. Rubisco
- B. Ribulose
- C. Ribulose bisphosphate
- D. Cytochrome
Explanation
The correct answer is Rubisco, which stands for ribulose bisphosphate carboxylase/oxygenase. This enzyme catalyzes the first major step of carbon fixation in the Calvin cycle, making it the most abundant protein in chloroplasts and likely on Earth.Option B, ribulose, is a sugar, not a protein. Option C, ribulose bisphosphate, is also a sugar and not a protein. Option D, Cytochrome, refers to a group of proteins involved in the electron transport chain, but they are not as abundant as Rubisco in chloroplasts.
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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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