Discussion
Which of the following statements best characterizes an antibody?
Answer: D
Correct answer: An antibody contains protein as its major chemical component and its synthesis may be elicited by the administration of a foreign protein or polysaccharide.
This option gets both halves right: an antibody is chiefly protein, and its production is provoked by a foreign antigen, which may be a protein or a polysaccharide. The others fail on a point of fact - there is no RNA in an antibody, it separates from albumin on electrophoresis, and its four chains are two identical pairs rather than four identical subunits.
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