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
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a. arsenic b. methylmercury c. chelated iron d. lead e. uranium hexafluoride
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a. provide a mechanism for rapid response to changes in the body. b. maintain a relatively constant internal fluid environment. c. inhibit nervous system effects on muscles and glands. d. allow for a mechanism to control gene action. e. do all of these.
The three-dimensional structure of a protein is determined primarily by:
A) electrostatic guidance from nucleic acid structure. B) how many amino acids are in the protein. C) hydrophobic interaction with lipids that provide a folding framework. D) modification during interactions with ribosomes. E) the sequence of amino acids in the protein.
If there is 28% adenine, then there must be 28% cytosine for the DNA composition of a particular organism.
Answer the following statement true (T) or false (F)