Which of the following statements best characterizes an antibody?

Q. Which of the following statements best characterizes an antibody?

A.            An antibody contains high molecular weight RNA as its basic structure

B.            An antibody is composed of protein and cannot be distinguished from the albumin fraction of the serum proteins

C.            An antibody is composed of four identical protein subunits which may be caused to dissociate by treatment with urea

D.            An antibody contains protein as its major chemical component and its synthesis may be elicited by the administration of a foreign protein or polysaccharide

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