Repair of an apurinic or apyrimidinic site in DNA by AP endonuclease must be completed by the action of
A. DNA polymerase I.
B. RecA protein.
C. UvrABC endonuclease.
D. None of the choices are correct.
Answer: A
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Alternative splicing allows for:
A. two or more different proteins to be made from a single processed mRNA. B. different polypeptides to be made from a single gene. C. increased stability of a mature mRNA. D. enhanced recognition of an mRNA by a ribosome. E. multiple genes to be used to code for a single polypeptide chain.
The most amount of energy is available to
a. A. b. B. c. C. d. D. e. E.
Although most of the mechanisms of evolution are nonrandom, the one that is absolutely random is ________
A) sexual selection B) natural selection C) artificial selection D) genetic drift
Which of these events is an example of indirect contact transmission?
A) A person develops plague from a flea bite. B) Vacationers develop shigellosis, caused by the intestinal pathogen Shigella spp., after drinking contaminated water. C) Tuberculosis is spread from one person to another after traveling through the air for several meters. D) A person drinks from a cup used by another individual. E) Several people become infected with Listeria after consuming contaminated ice cream.