To become bound to hemoglobin for transport in a mammal, atmospheric molecules of oxygen must cross _____
A) zero membranesâ€"oxygen binds directly to hemoglobin, a protein dissolved in the plasma of the blood
B) one membraneâ€"that of the lining in the lungsâ€"and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood
C) two membranesâ€"in and out of the cell lining the lungâ€"and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood
D) four membranesâ€"in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillaryâ€"and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood
E) five membranesâ€"in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillary, and into the red blood cellâ€"to bind with hemoglobin
Answer: E
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Neuroendocrine cells release neurohormones which are transported through contact or diffuse through
interstitial fluid. ____________________ Indicate whether the statement is true or false.
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 do not open when exposed to a narrow band of green light.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.
Which of the following is the most recent example of evolution and natural selection?
A. the genetic differences among the various populations on Earth B. the occurrence of many different breeds of dogs C. the development of pesticide-resistant insects D. the presence of long generation times in organisms