Which of the following must occur prior to the others in infecting a cell?
a. penetration.
b. adsorption.
c. uncoating.
d. replication.
Answer: b. adsorption.
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True or False: If the receptors for pheromones are activated, a mating will be guaranteed
A. true B. false
Natural selection has fueled the rise in MRSA (methicillin-resistant Staphylococcus aureus) infection by
A) enabling people to use a greater variety of antibiotic drugs to fight the infection. B) inactivating a greater variety of antibiotic drugs. C) enabling certain bacterial variants to survive in the presence of many antibiotic drugs. D) killing all bacteria exposed to antibiotics, including helpful ones.
The AIDS drug AZT is derived from ____
a. gorgonians b. sponges c. corals d. snails e. sea anemones
Cervical cancer
a. kills about 3,600 U.S. women each year. b. can affect young women. c. death occurs more often in women who have not had a pap smear. d. can be caused by genital HPV which has about 80% infectivity in sexually active women in the U.S. e. includes all of these.