Restriction enzymes cut double-stranded DNA
a. between genes.
b. at specific base sequences
c. between bacterial and viral DNAs.
d. between purines and pyrimidines.
e. between promoter and operator DNA sequences.
Answer: b
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The cell membranes of wall-less archaeons are strengthened by ________.
A. lipid-containing polysaccharide B. caldarchaeol C. glycoproteins D. All of the choices are correct.
Irreversible enzyme inhibitors
A) bind to the active site of an enzyme through noncovalent bonds. B) have only a temporary effect on enzyme activity. C) are often toxic to cells. D) are not active against ribozymes. E) are uncommon in nature.
The boundary that surrounds the contents of the nucleus is the
a. plasma membrane. b. nuclear envelope. c. nuclear pore. d. cytosol.
Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. These offspring will breed with each other or with birds from either parent population, and all offspring of these pairings appear intermediate to various degrees. The two populations are _____.
A. different subspecies, under the morphological species concept B. different species, under the biological species concept C. different species, under the phylogenetic species concept