Which of the following describes conditions in a photosynthesizing cell, exposed to high light intensity and low carbon dioxide concentration?
Correct answer: A. Option A
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
In a photosynthesizing cell exposed to high light intensity and low carbon dioxide concentration, the rate of photosynthesis may be limited by the availability of carbon dioxide. The concentration of CO2 acceptor (RuBP) may increase as the available CO2 is used up in the Calvin cycle. The concentration of ATP may increase as the light-dependent reactions continue to produce ATP in response to high light intensity. However, an increase in ATP concentration alone is unlikely to have a significant effect on the rate of photosynthesis. The concentration of G3P (PGA) may decrease as the available carbon dioxide is used up in the Calvin cycle, leading to a decrease in the rate of carbon fixation.
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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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