A nonspecific class of chemicals that can inhibit viruses and cancer cell growth is _____.
A) antibodies
B) peptides
C) interferon
D) antigens
Ans: C) interferon
Interferon is a class of peptides produced by many cell populations that can block the synthesis of DNA or RNA and therefore interferes with viral or tumorous cell growths.
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The latent period of an isotonic twitch is shorter than the latent period of an isometric twitch.
Answer the following statement true (T) or false (F)
In reuptake
A. a neurotransmitter that has already been released into the synaptic cleft is taken back into the synaptic knob of the presynaptic neuron. B. an action potential reverses direction. C. a neuropeptide breaks down into amino acids, which act as neurotransmitters. D. an enzyme breaks down a neurotransmitter and then another enzyme builds it back up.
Specific prevertebral ganglia are named after the
A. effector organ stimulated by the postganglionic axon. B. major abdominal arteries around which they are found. C. vertebra from under which the preganglionic axon travels. D. distance from the corresponding parasympathetic ganglion. E. early anatomist who discovered and described them.
True or False? In a myelinated fiber, only the initial segment in the trigger zone has voltage-regulated channels.
Answer the following statement true (T) or false (F)