Why is combination drug therapy less likely to lead to resistance than single drug therapy?
A) In the presence of multiple drugs, the mutation rate of HIV decreases.
B) The drugs improve the immune system so that it's better able to find and remove virus particles.
C) The likelihood of one virus spontaneously mutating to be resistant to three different drugs is extremely small.
D) There are fewer side effects associated with combination drug therapy, and the appearance of resistance is directly proportional to the severity of side effects.
C
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Which of the following statements about RNA processing in eukaryotes is INCORRECT?
A. Introns are simply excised out of pre-mRNA to produce the mature mRNA. B. A complex composed entirely of proteins is used to remove introns from the pre-mRNA. C. A poly A tail is added on to the 3? end of the mRNA. D. A 7-methylguanosine cap is added on to the 5? end of the mRNA. E. Processing occurs in the nucleus.
Fertilization take place within a woman's body in which of the following ART techniques?
a. GIFT b. ICSI c. IVF d. ZIFT e. PGD
Which is not a potential problem of allowing the genomic sequences of individuals to become widely available?
A) Discrimination by insurance companies. B) Misinterpretation of the information. C) Misuse of the information for social purposes. D) Advances leading to healthier lives for some people.
Young male white-crowned sparrows that were experimentally raised without ever hearing the song of their species
____.
a. instinctively performed the song perfectly b. never sang at all c. sang a poorly developed, but similar, version of their species' song d. sang a recognizable version of an ancestral species’ song e. never sang the way wild males do