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Biology · 2025 · 2 marks
CBSE 2025 · Region 5 · Set 1 · Q17
(a) Give an account of the generalised structure of an antibody molecule produced by B-lymphocytes in response to the pathogen.
(a)
Give an account of the generalised structure of an antibody molecule produced by B-lymphocytes in response to the pathogen.
OR
(b)
Other than public awareness and counselling, enlist four measures taken up by NACO, WHO and other NGOs to prevent the spread of HIV infection in the society.
Marking-scheme solution
-Each antibody molecule has four peptide chains/an antibody molecule is represented as
H2L2
-Two small chains called light chains
-two longer chains called heavy chains
-It has an antigen binding site at N end (amino end)
It has disulphide bond between different parts of proteins or proteins of different chains
Ensuring availability of HIV free blood in blood banks
Ensuring the use of only disposable needles and syringes in public and private hospitals
and clinics
Free distribution of condoms.
Controlling drug abuse.
Advocating safe sex.
Promoting regular check-ups for HIV in susceptible populations.
Preventing infection during blood transfusions in patients.
Monitoring of pregnant women for HIV
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.