Antigens are
A. chemicals that enhance all lymphatic organs.
B. foreign molecules to which white blood cells can bind through specialized receptors, leading to the proliferation of lymphocytes.
C. proteins produced by plasma cells that stimulate the clotting of blood.
D. proteins produced by virus-infected cells that stimulate an immune response.
Answer: B
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The diapsids diverged into the lepidosaurs and the archosaurs. From which of these groups did the snakes arise?
a. archosaurs b. neither of these groups c. lepidosaurs d. There are species of snakes from both of these groups.
What cell component is an important factor in the
pathogenicity of many disease-causing bacteria? a. nucleoid b. pilus c. polysaccharide capsule d. flagella e. cell wall
What quality do cardiac and skeletal muscles share?
a. they are both smooth muscle b. they are both voluntary muscle c. they are both involuntary muscle d. they are both striated e. they are both found in the heart
Activated by directly binding to GTP
a. Adenylate cyclase b. G-protein c. Carrier protein d. cAMP e. Ion channel receptor protein