Members of the Enterobacteriaceae can be distinguished from each other by
A) the presence or absence of the enzyme oxidase.
B) the ability to ferment lactose.
C) motility.
D) both motility and the presence or absence of the enzyme oxidase.
E) both motility and the ability to ferment lactose.
E
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You have isolated DNA from actively replicating cells. Where would you expect to find this DNA on a gel?
A) DNA would be highly supercoiled and would be found in the band seen in the positive pole (bottom) of Lane 1. B) DNA would be predominantly relaxed and would be found in the band seen in the positive pole (bottom) of Lane 1. C) DNA would be highly supercoiled and would be found in the band seen in the negative pole (top) of Lane 1. D) DNA would be predominantly relaxed and would be found in the band seen in the negative pole (top) of Lane 1. E) DNA would be both relaxed and supercoiled, so it would appear in a pattern similar to Lane 2.
How does smooth muscle differ from skeletal muscle?
a. Smooth muscle attaches to bones via tendons. b. Smooth muscle has a striated appearance. c. Smooth muscle undergoes quick contractions. d. Smooth muscles are connected via gap junctions. e. Smooth muscle cross bridges form transiently.
The nuclear localization signal is typically a(n) _______, rich in the amino acids _______.
a. -helix; Pro, Lys, and Arg b. -helix; Leu, Phe, and Gly c. short chain; Lys and Arg d. short chain; Phy and Gly
When proteins are synthesized by ribosomes on the rough endoplasmic reticulum, where does the translation begin?
A) cytosol B) rough endoplasmic reticulum C) smooth endoplasmic reticulum D) nucleus E) Golgi apparatus