Inserting a gene from the hepatitis B virus into yeast so that the yeast produces a viral protein is an example of
A. etiology.
B. genetic engineering.
C. immunology.
D. microbial genetics.
E. gene therapy.
Answer: B
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Which tooth type may not be present in herbivores yet prominent in carnivores?
a. canines b. incisors c. molars d. premolars e. The teeth types of herbivores and carnivores are the same.
DNA polymerase
a. is an enzyme. b. adds new sugars to a strand. c. proofreads RNA strands to see that they are correct. d. unwinds the DNA molecule during repair. e. is made of uracil.
HIV requires an enzyme called ________ to convert its RNA genome to a DNA version.
a) reverse transcriptase b) DNA polymerase c) RNA polymerase
The expression of the tryptophan operon is controlled by a(n)
A) repressor that is active when it is alone. B) repressor that is inactive when it binds to lactose. C) repressor that is active when it binds to tryptophan. D) activator that turns the operon on by binding to DNA.