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.
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.
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Skin color and eye color are examples of
a. traits related to pleiotropic genes. b. single gene traits. c. polygenic traits. d. bigenic traits. e. mutually exclusive traits
The health risk of a pathogen is determined by its transmissibility and its virulence.
a. true b. false
As a botanist working for a field museum, you spend many hours in the field looking for new species. On a recent trip you may have discovered a new plant species. The plant is very short, and has a stem but no roots or leaves. The stem forks and has branches that have sporangia on the tips. Further analysis reveals vascular tissue. What type of plant might you have discovered?
A. Angiosperm B. Gingko C. Rhyniophyte D. Bryophyte E. Gymnosperm
Place each of the following terms with the correct statement.A. CoevolutionB. Defensive colorationC. CamouflageD. Secondary chemical compoundsE. Batesian mimicryOrganisms that possess this property are poisonous, sting, or are otherwise harmful, commonly black, yellow, and red in color.
Fill in the blank(s) with the appropriate word(s).