Question

Which of the following statements about antibodies is correct?

A. Antibodies are polypeptides.
B. Antibodies are produced by the bone marrow.
C. Antibodies are pathogenic foreign substances.
D. Antibodies kill bacteria but not viruses.

Answer 1

A is the correct answer. - Antibodies are polypeptides.

Antibodies are proteins made by B-Cells that are specific to the antigen of a foreign pathogen. Antibodies have to identical polypeptide chains that have a Y shape fold to hold down a specific antigen of the foreign pathogen.