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
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In a fetal pig, dorsal and ventral refer respectively to
(a) the head and tail regions of the body. (b) the tail and the head regions of the body. (c) the upper (back) portion and the lower (underside) portion of the body. (d) the lower (underside) portion and the upper (back) portion of the body.
Which of the following do not depend directly on
sunlight for energy? I. terrestrial producers II. animal consumers III. decomposers a. I only b. II and III only c. II only d. III only e. I and III
The aorta leaves the
a. left atrium. b. right atrium. c. left ventricle. d. right ventricle. e. the right and left ventricles.
The greenhouse gas presently at highest concentration in the Earth’s atmosphere is methane. Indicate whether the statement is true or false