Infected body cells can self-identify for destruction by the immune system by:
A) becoming dendritic cells.
B) releasing histamine.
C) reshaping their membranes into a pattern that B cells recognize.
D) secreting hormones that stimulate macrophages.
E) placing fragments of the infectious agent on their surfaces.
Answer: E
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The gag gene of the HIV genome encodes:
A. reverse transcriptase. B. capsid. C. integrase. D. surface glycoprotein. E. protease.
Compared to the first big syphilis epidemic several hundred years ago in Europe, the strains of Treponema pallidum that cause syphilis today
A. tend to be more virulent. B. tend to be less virulent. C. are about equally virulent. D. cannot be compared.
The "fluid mosaic" model of the plasma membrane describes the plasma membrane as a solid, inflexible structure with a certain distribution of proteins that does not vary from cell to cell
a. true b. false
Which pair of activities are carrier molecules involved in?
a. passive transport and osmosis b. active and passive transport c. active transport and osmosis d. osmosis and diffusion