Which of the following is not a mode of action of an antiviral?
A. Bond to ergosterol in the cell membrane
B. Inhibit DNA synthesis
C. Block maturation
D. Block transcription and translation
E. Block viral entry into a host cell
Answer: A
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Which naturally-occurring plant hormone has a major role in the phototropic response of plants?
A. auxin B. gibberellin C. abscisic acid D. ethylene E. 2, 4-D
The antigen-binding region of an antibody is formed by the
A) constant region composed of a heavy chain and a light chain. B) variable region composed of two heavy chains. C) variable region composed of two light chains. D) variable region composed of a heavy chain and a light chain. E) constant region composed of two light chains.
Most people afflicted with recessive disorders are born to parents who were
A) both affected by the disease. B) not affected at all by the disease. C) slightly affected by the disease, showing some but not all of the symptoms. D) subjected to some environmental toxin that caused the disease in their children.
The self-identifying proteins on self body cells are called
A. interferons. B. interleukin-1. C. MHC proteins. D. plasma proteins. E. perforins.