What evidence suggests that a cell spends the majority of its time in interphase?
a) a large percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time
b) a moderate percentage of cells in a tissue of cell culture are seen to be in mitosis at any given time
c) only a small percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time
d) interphase is more useful
Ans: c) only a small percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time
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An organism whose genetic makeup allows it to produce more offspring than another of its species is said to have greater
(a) fitness. (b) evolution. (c) foraging. (d) selection.
A researcher wants to introduce the human gene encoding tissue plasminogen activator (used to dissolve blood clots) into a mammal so that the protein will be secreted into the milk of the mammary gland. What is required for the researcher's success?
A. The gene should be placed a considerable distance away from the promoter of a gene that is expressed in mammary cells. B. The gene should be placed next to the promoter of a gene that is expressed in mammary cells. C. The gene should be placed a considerable distance away from the promoter of a gene that is expressed in multiple types of cells. D. The gene should be placed next to the promoter of a gene that is expressed in multiple types of cells. E. The gene should be inserted in place of the promoter of a gene that is expressed in multiple types of cells.
An agent that would work well as an antibiotic against prokaryotic infection would target the
A) 50S large ribosomal subunit. B) RNA polymerase II. C) 40S small ribosomal subunit. D) DNA polymerase. E) mitochondria.
Which mutation in DNA would lead to the change of a single amino acid in a protein?
A. a frameshift B. a missense mutation C. a nonsense mutation D. one base insertion E. one base deletion