The condition known as graft-versus-host disease may result after
A. a bone marrow allograft.
B. a mismatched blood transfusion.
C. a bone allograft.
D. a plasmapheresis procedure.
E. any type of allograft procedure.
Answer: A
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In a nucleotide, to which carbon in the sugar is the base attached?
A. 1' B. 2' C. 3' D. 4' E. 5'
Water stabilizes body temperature and dissolves many substances because
a. it evaporates easily. b. its molecules are covalent. c. its molecules are ionic. d. it contains hydrogen bonds. e. it is free of minerals
Which of the following is characteristic of ciliates?
A) They use pseudopods as feeding structures. B) They are often multinucleate. C) They can exchange genetic material with other ciliates by the process of mitosis. D) Most live as solitary autotrophs in fresh water.
When both light and temperature are increased, the rate of photosynthesis will:
A) remain the same because the increase in light will be counteracted by the increase in temperature. B) increase because the activity of the first photosystem will increase, whereas the activity of the second photosystem will remain constant. C) increase because the activity of the Calvin cycle will increase due to the increase in light. D) decrease because the increase in temperature will prevent photophosphorylation. E) increase because the activity of the photosystems will increase due to the increase in light, and the activity of the Calvin cycle will increase due to the increase in temperature.