Once it is inside a human cell, the HIV enzyme, ________, manufactures a DNA copy from the viral RNA.
A. reverse transcriptase
B. DNA polymerase
C. forward transcriptase
D. helicase
Answer: A
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The organelle responsible for the biosynthesis of proteins that are destined for secretion by the cell is the
A. Golgi apparatus. B. lysosome. C. vesicle. D. endoplasmic reticulum. E. mitochondria.
The tubercles formed in primary tuberculosis are caused by an influx of ________.
A. mononuclear cells B. neutrophils C. basophils D. antibodies E. polymorphonuclear leukocytes
Circular DNA molecules found in nature are
A) positively supercoiled. B) negatively supercoiled. C) not supercoiled, due to their small size. D) always oriented in a triple helix to conserve space. E) always in the Z-DNA formation.
Which of the following pairings of recombinant DNA techniques and applications does NOT match?
a. genetic modification of yeast: production of purified insulin b. gene therapy: replacing a defective gene c. PCR: making many copies of a segment of DNA d. gene silencing: production of subunit vaccines