Sickle-cell anemia is caused by ____
a. an RNA error
b. expansion mutation
c. deletion mutation
d. fragile X syndrome
e. a base-pair substitution mutation
ANSWER: e
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What is the role of MHC I in the immune response?
A) MHC I is found on all body cells except red blood cells. B) MHC I presents a sample of cellular proteins, including those of any intracellular pathogens, to T cells. C) MHC I is found on all body cells except red blood cells and presents a sample of cellular proteins, including those of any intracellular pathogens, to T cells. D) MHC I is found only on antigen-presenting cells and presents a sample of cellular proteins, including those of any intracellular pathogens, to T cells. E) MHC I is found only on antigen-presenting cells.
The intermediate disturbance hypothesis posits which of the following?
a. Species richness is greatest in communities that experience infrequent moderate disturbances. b. Species richness is greatest in communities that experience high temperatures. c. Species richness is greatest in communities that experience frequent severe disturbances. d. Species richness is greatest in communities that experience frequent moderate disturbances. e. Species richness is greatest in communities that experience intense disturbances.
The ________ expedition is accredited to the birth of modern marine biology and oceanography
a. HMS Challenger b. HMS Agassiz c. HMS Alvin d. HMS Beagle
All of the following are functions of the mammalian kidney EXCEPT
A. water retention. B. filtration of blood. C. excretion of nitrogenous waste. D. regulation of salt balance in the blood. E. production of urea.