Identify the statement that is NOT correct.

(A)Antigen binding site is located at C-terminal region of antibody molecules.
(B)Constant region of heavy and light chains are located at C-terminus of antibody molecules
(C)Each antibody has two light and two heavy chains.
(D)The heavy and light chains are held together by disulfide bonds.

The NCERT line that answers it

Verbatim line

The variable regions (VH and VL) at the tips of the Y arms are responsible for antigen binding.

Chapter: Human Health and Disease
Section: 7.1 COMMON DISEASES IN HUMANS

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that antigen binding occurs at the variable regions at the tips of the Y arms, which corresponds to the N-terminus, not the C-terminus, directly proving option A is incorrect.

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