Where does precursor-mRNA (pre-mRNA) typically exist?
a. in both prokaryotes and eukaryotes
b. only in prokaryotes
c. only in the nucleus of eukaryotes
d. only in the cytoplasm of eukaryotes
Ans: c. only in the nucleus of eukaryotes
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The cardiac, pyloric, anal, and ileocecal sphincters are all part of the
(a) digestive tract. (b) respiratory tract. (c) circulatory system. (d) muscular system.
What is the fate of CoA after it delivers an acetyl group into the citric acid cycle?
a. It is degraded and used for energy. b. It is recharged with another acetate. c. It is used in protein synthesis. d. It remains in an inactive form until the cell dies. e. It is reused to start glycolysis.
The percentage change in one variable with a percentage change in another is known as a(n):
A. linear effect. B. log-level change. C. percentage point change. D. elasticity.
In general, the organization of genes in bacteria is different from that in eukaryotes. In E. coli, approximately 27 percent of all genes are organized into contiguous, functionally related units containing multiple genes under coordinated control that
are transcribed as a single unit. Such contiguous gene families are called ________. A) operons B) transcriptomes C) proteomes D) pseudogenes E) contigs