Which of the following is not a factor that increases mutations?

A. Replication error
B. Fast rates of replication
C. UV radiation
D. Ionizing radiation
E. Repair enzymes


Answer: E

Biology & Microbiology

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The process of human X-chromosome inactivation in female cells:

A. is more common for the paternal X chromosome than the maternal X chromosome. B. condenses one copy of the X chromosome into heterochromatin. C. is necessary to ensure that only Y chromosome genes are expressed in some cells. D. All of the choices are correct.

Biology & Microbiology

The first phylum with three germ layers is

a. Cnidaria. b. Platyhelminthes. c. Annelida. d. Arthropoda. e. Nematoda.

Biology & Microbiology

If tyrosine and isoleucine undergo condensation, the new bond that is formed is between the:a

oxygen of the R group and the hydrogen of the amino group. b. carbon of the R group and the nitrogen of the amino group. c. carbon of the carboxyl group and the hydrogen of the R group. d. carbon of the carboxyl group and the hydrogen of the amino group. e. carbon of the carboxyl group and the nitrogen of the amino group.

Biology & Microbiology

A decrease inPCO2 within the lung will result in a ________ in the pulmonary vasculature and a ________ in the bronchioles.

A) lack of change : weak bronchoconstriction B) weak vasoconstriction : bronchodilation C) weak vasodilation : bronchoconstriction D) vasoconstriction : lack of change E) vasodilation : weak bronchodilation

Biology & Microbiology