A person who has type AB blood
A. has type A & B antigens.
B. produces anti-A and anti-B antibodies.
C. has only type A antigens.
D. cannot receive type A or type B blood in a transfusion.
Answer: A
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The sulfur cycle is similar to the cycle of
A. carbon. B. oxygen. C. nitrogen. D. phosphorus.
A toxic substance has been found to inhibit glucose transport into mammalian cells. If this substance is administered
to a hamster, the likely cause of death would be a lack of ____ production.
a. NAD+ b. ATP c. GTP d. CO2 e. FAD
Which method of animal cell infection is used by enveloped viruses, but not non-enveloped viruses?
a. receptor-mediated endocytosis b. membrane-channel injection c. fusion d. diffusion
As population density increases, the chance of
____ also increases.
a. pathogens b. parasitism c. predation d. competition e. all of these