The G1, S, and G2 phases of the cell cycle are collectively known as
A. meiosis.
B. metaphase.
C. prophase.
D. interphase.
E. mitosis.
Answer: D
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Chromatin remodeling
a. is subject to well-characterized stages of regulation by the cell. b. blocks access to genes that should not be expressed in a particular cell. c. is unaffected by alterations to the DNA sequences of a cell. d. results in specific patterns of gene expression. e. is generally independent of histone protein arrangements.
Retroviruses are characterized by
a. an RNA core. b. integrating DNA into the host’s chromosome. c. the enzyme reverse transcriptase. d. having one strain that causes AIDS. e. all of these
For which of the following diseases would animal models likely yield the most information?
A. Alcoholism D. Huntington disease B. Schizophrenia E. PKU C. Bipolar disorder
Which is not characteristic of all life?
A. responsiveness B. evolution C. reproduction D. random cell structure