Some restriction enzymes leave behind "sticky ends," or tails of
A.) repeating bases.
B.) exposed bases.
C.) paired bases.
D.) restricted bases.
Ans: B.) exposed bases.
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Many crustaceans (for example, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of _____
A) convergent evolution B) a homologous structure C) natural selection D) a vestigial trait
Lipid A is found only in Gram negative bacteria
a. true b. false
The release of the protein insulin from pancreatic cells occurs by
A. pinocytosis. B. phagocytosis. C. receptor-mediated endocytosis. D. exocytosis. E. endocytosis.
All cells possess a plasma membrane, which functions to _____.
A) enclose the cell B) isolate the cell from random disturbances in the environment C) allow metabolic events to occur in an orderly fashion D) all of the choices