Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Researchers discover that guard cells of the lady slipper orchid lack chloroplasts; yet the guard cells regularly open and close.

A. Supports both hypothesis I and II.
B. Supports only hypothesis I.
C. Supports only hypothesis II.
D. Supports neither hypothesis.


Answer: C

Biology & Microbiology

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