The ________ molecule is attached to dense bodies in smooth muscle cells.
A. myosin
B. actin
C. troponin
D. tropomyosin
Answer: B
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The three forms of matter are
A. vapor, water, and solid. B. air, water, and solids. C. solids, liquids, and gases. D. blood, bone, and air.
T cells may produce _____, which is lethal to the target cells invaded by a pathogen.
A) interleukin-2 B) perforin C) interferon D) interleukin-3
Synthesis of neuropeptides differs from that of other neurotransmitters because it:
A. takes place in the axon terminals of neurons. B. takes place in the cell bodies of neurons. C. takes place on ribosomes in the postsynaptic cell's membrane. D. uses amino acids as precursor molecules. E. only takes place at synapses outside the central nervous system.
The leading strand of DNA is formed as
A. soon as the lagging strand is formed. B. a continuous strand, adding to the 5´ end. C. a continuous strand, adding to the 3´ end. D. a template. E. short segments called Okazaki fragments.