MHC I molecules present
A) processed foreign antigens from proteasomes.
B) processed self-antigens from phagolysosome.
C) antibodies.
D) T cell antigens.
Answer: A) processed foreign antigens from proteasomes.
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Ctenopores (comb jellies):
A. have a separate mouth and anal pore, unlike cnidarians. B. have a separate epidermis and endodermis, which cnidarians lack. C. are usually filter feeders that attach themselves to the ocean bottom. D. are a type of bilaterian.
Predict the change in surface area and volume of a spherical cell if the diameter of the cell doubles:
A. The surface area will increase by a factor of 4, while the volume will increase by a factor of 8. B. The surface area will increase by a factor of 8 while the volume will increase by a factor of 4. C. The surface area will increase by a factor of 2 and the volume will increase by a factor of 4. D. The surface area and volume will both increase by a factor of 4.
Pulmonary edema describes a condition where the uptake of oxygen and unloading of carbon dioxide is reduced as a consequence of a(n)
A) decrease in the partial pressure of carbon dioxide in the alveolus. B) increase in the partial pressure of oxygen in the blood. C) thickening of the diffusion barrier by fluid accumulation in the pulmonary blood. D) thickening of the diffusion barrier by fluid accumulation in the alveoli. E) decrease in the partial pressure of oxygen in the alveolus.
Which animal is an induced ovulator?
A. dogs B. apes C. rabbits D. humans