Question of 117
Q.Identify the parts labelled A, B, C and D in the diagram of an antibody molecule and select the correct options :
(a) A – Light chains, B – Heavy chains, C – Antigen-binding sites, D – Disulphide bonds
(b) A – Disulphide bonds, B – Antigen-binding sites, C – Heavy chains, D – Light chains
(c) A – Antigen-binding sites, B – Light chains, C – Heavy chains, D – Disulphide bonds
(d) A – Antigen-binding sites, B – Disulphide bonds, C – Light chains, D – Heavy chains
Punjab PsebPSEB Punjab Class 12 Board 2026MCQ· 1mImportance★★★★★
0% · 0/117 Questions
You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.
Start your 14-day free trial to unlock the full solution →An antibody is a Y-shaped H2L2 molecule: the two arm tips are the antigen-binding sites, the two short outer chains are light chains, the two long chains are heavy chains, and the chains are held together by disulphide bonds — matching option (c).
In the CBSE/NCERT Human Health and Disease chapter, an antibody (immunoglobulin) is written as H2L2:
- A – Antigen-binding sites: the two tips of the Y (the variable regions) where the specific antigen binds.
- B – Light chains: two short polypeptide chains.
- C – Heavy chains: two long polypeptide chains. …
Unlock everything free for 14 days
- Full step-by-step solutions
- Concept-first explanations
- Methods, shortcuts & mistakes
- PYQ mapping + timed mock tests
Full access for 14 days. No credit card required.