A virus that uses RNA to make DNA is referred to as a(n)
a. retrovirus.
b. archaevirus.
c. parvovirus.
d. poxvirus.
e. papovavirus.
A
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Which of the following are NOT important in chemical synapses?
A. gap junctions B. neurotransmitters C. specific neurotransmitter receptors D. secretory vesicles E. voltage-gated Ca2+ channels
Nudibranchs belong to the class ____ of the phylum Mollusca
a. Gastropoda b. Cephalopoda c. Bivalvia d. Polyplacophora e. Pulmonata
Smooth muscle
A) contracts when stretched. B) is under voluntary control. C) does not contain actin or myosin. D) produces rapid contractions.
Which part of the immune system's "learning system" is responsible for maintaining life-long immunity against measles after a measles infection?
a. somatic recombination c. affinity maturation b. clonal expansion d. retention of responding cells