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
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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.
The first phylum with three germ layers is
a. Cnidaria. b. Platyhelminthes. c. Annelida. d. Arthropoda. e. Nematoda.
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.
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