Auxin:
A. prevents cell elongation.
B. is transported from young leaves to
differentiated vascular tissue.
C. has a net positive charge in the cytoplasm
of cells.
D. inhibits cellular production of PIN proteins.
E. inhibits fruit ripening.
B
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Which of the following enzymes relieves the strain in DNA introduced by unwinding in E. coli?
A. gyrase B. ligase C. primase D. helicase E. SSB
The alternative forms of a gene that can be expressed are known as
A) alleles. B) genes. C) loci. D) spores. E) haplotypes.
In vertebrates, the neurotransmitter acetylcholine
a. can act as a direct neurotransmitter between neurons and muscle cells. b. can make it more difficult for some postsynaptic membranes to reach threshold. c. can be released into circulation and act as a hormone. d. can act as a pain reducer and initiate euphoria. e. a and b only
Local edema, swollen lymph nodes, fever, soreness, and abscesses are indications of
A. inflammation. B. toxemia. C. latency. D. sequelae. E. a syndrome.