A chimpanzee's closest extant relative is a(n)
A. orangutan.
B. mandrill.
C. South American spider monkey.
D. human.
D. human.
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The human immunodeficiency virus (HIV) uses RNA, rather than DNA, to encode genetic information. During infection, however, HIV uses an enzyme known as reverse transcriptase to generate double-stranded DNA. Generally speaking, how would the enzyme generate a double strand of DNA from a single strand of RNA?
A. Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one. B. Reverse transcriptase first catalyzes the synthesis of a RNA copy from the viral DNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one. C. Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA from the viral RNA.
What type of sensory receptor are taste buds?
A. mechanoreceptors B. nociceptors C. chemoreceptors D. thermoreceptors
Intramembranous ossification step 4
What will be an ideal response?
Cigarette smoking ________
A) is responsible for about one in five deaths of Americans every year B) accounts for 80—90% of all cases of lung cancer C) can affect the health of nonsmokers through secondhand smoke D) all of the above