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.Stomata opening after illumination following eight hours in darkness: plant is Xanthium pennsylvanicum.

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


Answer: A

Biology & Microbiology

You might also like to view...

Mutations that inhibit the function of photosystem I but not photosystem II would result in a plant cell that could still generate ______.

A. produce O2, ATP, and NADP+ B. produce ATP and NADP+ C. produce O2, ATP, and NADPH D. produce ATP and NADPH E. produce CO2 and ATP

Biology & Microbiology

Which of the following is not a product or reactant of glycolysis?

a. NADH b. ATP c. pyruvate d. oxygen

Biology & Microbiology

The reaction (H2 + F2 ? 2HF) is an example of a redox reaction. In reality, two half reactions are occurring. The half reaction (H2 ? 2H+ + 2e-) is a(n)

A. potential energy reaction. B. reduction reaction. C. redox reaction. D. oxidation reaction.

Biology & Microbiology

Which sensory modality responds to the broadest range of molecules?

A. Taste B. Smell C. Vision D. Touch E. TRP channels

Biology & Microbiology