The last case of naturally contracted smallpox occurred in

A. 1900.
B. 1950.
C. 1965.
D. 1977.
E. 1989.


D

Biology & Microbiology

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Copy number variants

A) are extremely rare, occurring in only about a dozen sites in the genome. B) are found only in even-numbered chromosomes. C) number in hundreds to thousands. D) are five or fewer bases long.

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True jellyfish belong to the class Scyphozoa of the phylum Cnidaria

Indicate whether the statement is true or false

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Cytoplasmic DNA is a feature of _______________cells

a. eukaryotic b. prokaryotic c. animal d. plant

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The immune system component with a principal role at point B in the accompanying figure is:

a. memory cells. b. IgM antibodies. c. IgG antibodies. d. cytotoxic T cells. e. antibody IgA.

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