External respiration
a. moves carbon dioxide from alveoli into the blood.
b. moves oxygen from alveoli into the blood.
c. moves oxygen from the blood into alveoli and carbon dioxide in the opposite direction.
d. moves oxygen from alveoli into the blood and carbon dioxide in the opposite direction.
e. moves both oxygen and carbon dioxide from alveoli into the blood.
D
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The plasma membrane of eukaryotes contains all of the following EXCEPT
A. sterols. B. peptidoglycan. C. sphingolipids. D. phosphoglycerides.
Amino acids are the building blocks for:
a. proteins b. steroids c. lipids d. nucleic acids e. carbohydrates
Oxyhemoglobin tends to give up oxygen where
a. the pH is low. b. the tissues are warmer. c. the partial pressure of O2 is low. d. the partial pressure of CO2 is high. e. all of these occur
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.Which hypothesis is supported by the fact that cells of wilting leaves produce abscisic acid, which causes guard cells to close?
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.