Smallpox is a disease in which
A. recurrent episodes are called shingles.
B. the virus becomes latent in ganglia of sensory neurons.
C. fever, malaise, and rash occur.
D. transmission occurs by direct contact with skin crusts.
E. All of the choices are correct.
Answer: C
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Which of the following is crucial to activation of the adaptive immune response?
A) memory cells B) presentation of MHC (major histocompatibility complex)-antigen complex on a cell surface C) somatic hypermutation D) phagocytosis of antibody-antigen complex by macrophages in the blood (the humoral response)
Which of the following helminths is correctly paired with its portal of entry?
A. Ascaris lumbricoides - enters through the skin B. Taenia solium - eggs or larvae can be ingested C. Enterobius vermicularis - sexual transmission D. Schistomoma species - carried by an insect vector into human
Strands of protein that help stop substances from leaking across a tissue are called
a. gap junctions. b. adhering junctions. c. intercalated discs d. tight junctions. e. desmosomes
Mutations are the original source of new alleles, but may be adaptive, __________ or __________.
Fill in the blank(s) with the appropriate word(s).