Question

When a Chlamydomonas culture is exposed to LOW intensity light, the cells will move toward the light (positive phototaxis). Cells move toward the light to increase their rate of photosynthesis. Which of the following scenarios would signal to a cell that it should increase its rate of photosynthesis?

• A. Low levels of P680.
• B. Low levels of ADP relative to ATP.
• C. High levels of NADP⁺ relative to NADPH.
• D. High levels of G3P in the stroma.

Answer 1

C is the right answer as the high ratio of NADP+/NADPH would signal to the cell that it should increase the rate of photosynthesis. All the other options are incorrect because they will not increase the rate of photosynthesis.

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