Answers for the multiple choice questions on Assignment #1

1.  HIV is a(n) (circle all that apply)
virus      bacteria      intracellular parasite
ANSWER:  HIV is a virus and intracellular parasite

2.  How does HIV "reproduce"?
a.  Makes its own sperm and eggs
b.  Uses the host cell to make DNA from HIV's RNA
c.  Can reproduce on its own, but must use host cell to make proteins
d.  All of the above
ANSWER:  b

4.  Which of the following mechanisms are involved in the evolution of resistance to AZT? (Circle all that apply)'
a.  genetic drift         b.  gene flow         c.  selection         d.  mutation
ANSWER:  c and d

5.  Which of the following becomes resistant to AZT and other drugs?
a.  the person infected with HIV
b.  the HIV virions
ANSWER:  b

7.  Why is HIV considered to have "short-sighted" evolution?
a.  Lethal strains of HIV become predominant in the viral population inside the host because they enjoy a short term advantage in survival and reproduction.
b.  HIV strains with mutant nef genes are rare because they are seldom transmitted from one host to another.
c.  the delta32 allele first appeared and achieved a high frequency among the Vikings, and then was disseminated across Europe during the Vikingraids of the 8th-10th centuries.
d.  HAART suppresses all replication and only dormant virions persist.
ANSWER:  a


Questions 3, 6, 8, 9, & 10 will not be covered on Exam #2