In skeletal muscle contraction, which of the following is the neurotransmitter released at the axon
terminal to trigger an action potential in the muscle cell?
a. troponin
b. Ca2+
c. tropomyosin
d. ATP
e. acetylcholine
E
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How does a macrophage destroy a pathogen?
A. production of antibodies B. phagocytosis C. secretion of histamine D. opsonization
Using restriction enzymes, a eukaryotic gene is cut, ligated into a bacterial plasmid, and introduced into a strain of E. coli. To better the odds of getting expression of the eukaryotic gene in this system, you need to make certain that
A) the gene has a eukaryotic promoter for transcription. B) the plasmid has a prokaryotic promoter for transcription. C) the gene and the plasmid were cut with different restriction enzymes. D) the gene product is toxic to the bacterial cell. E) mRNA is used for ligation directly into the vector.
Technology is the application of scientific knowledge to the interests of humans.
Answer the following statement true (T) or false (F)
A pollination syndrome is
A. a brushlike tongue of hummingbirds to which pollen adheres. B. the synchronous release of pollen by many individuals of wind-pollinated trees. C. a series of bristles on the backs of insects to which pollen adheres. D. the simultaneous release of two sperm, one to affect fertilization and the other to initiate formation of endosperm. E. specializations of plants that attract a specific kind of pollinator.