What is a hapten?
a. a small molecule that has reactivity but lacks immunogenicity
b. the heavy chain of an immunoglobulin molecule
c. the antigen binding site of an immunoglobulin molecule
d. the part of a lyrmphoid organ where antigens are processed
e. a self antigen genetically encoded by the mhc molecule

Option (A).

Explanation:

Haptens may be defined as incomplete antigen that are not capable of inducing an immune response.

Hapten is a small molecule that reacts with specific antibody but only generates an immune response when these are conjugated with the carriers or proteins. Penicillin is a hapten and generates an immune response when conjugated with the carrier molecule.

Thus, the correct answer is option (A).

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation: