Antigens are
A. proteins produced by plasma cells that stimulate the clotting of blood.
B. proteins produced by virus-infected cells that stimulate an immune response.
C. foreign molecules that bind to white blood cells through specialized receptors, leading to the proliferation of lymphocytes.
D. chemicals that enhance all lymphatic organs.
Answer: C
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Candle jars are usually used to
A. store candles. B. provide an atmosphere with CO2. C. stimulate the growth of obligate anaerobes. D. prevent the growth of obligate aerobes. E. provide an atmosphere with CO2 AND stimulate the growth of obligate anaerobes.
The base that is not found in DNA, but only in RNA is ________.
A. adenine B. guanine C. uracil D. thymine
The main cause of emphysema is
a. a genetic predisposition. b. exposure to chemicals in the workplace. c. recurring respiratory infections. d. long-term smoking. e. poor diet.
The floating peat over open water makes this habitat a
A) swamp. B) marsh. C) bog. D) fen.