Pneumocystis jirovecii
A. lacks ergosterol in its plasma membrane.
B. has protozoan and fungal characteristics.
C. is an obligate parasite.
D. causes serious infection in elderly, premature infants, and AIDS patients.
E. All of the choices are correct.
Answer: E
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Many human-infecting viruses that illicit a strong immune response cause additional harmful effects on humans, so the discovery of a virus that can induce an immune response but not cause harm made it attractive for vaccine development
Indicate whether the statement is true or false.
When wild-type offspring are produced from a cross between parents that both display the same recessive phenotype, this illustrates the genetic phenomenon of _______
A. simple recessive alleles B. incomplete penetrance C. complementation D. gene dosage E. a spontaneous mutation
Scientist believe that the formation of organic polymers, like RNA and DNA, had to move from the watery environment of the seas to solid surfaces or evaporating tidal pools because
A. dehydration is necessary for the formation of large organic polymers, too much water competes with dehydration. B. hydrolysis is necessary for the formation of large organic polymers, dehydration competes with polymerization. C. tidal pools would provide a concentrated area where more small organic molecules could aggregate. D. Kusky discovered 1.43 billion year old fossils in shallow water and tidal pools. E. sugars dissolve in water, ribose is a sugar and is necessary for the polymerization of DNA and RNA therefore being out of the water would speed up the polymerization reactions.
In order for a species to be successfully reintroduced into an area,
a. hunting must be restricted. b. populations of the animals cannot be too small. c. suitable habitat must be maintained. d. all of these