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Chemistry · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 3 · Q20
Differentiate between the following: (i) Fibrous protein and Globular protein (ii) Peptide linkage and Phosphodiester linkage
Differentiate between the following :
(i)
Fibrous protein and Globular protein
(ii)
Peptide linkage and Phosphodiester linkage
Marking-scheme solution
(i)
When polypeptide chains run parallel and are held together by hydrogen
and disulphide bonds. then fibre– like structure is formed / It is insoluble
in water.
When polypeptides coil around to give a spherical shape/soluble in water.
(ii)
It is an amide linkage formed between two amino acids through –CONH-
/an amide linkage formed between -COOH and -NH2 group of two amino
acids whereas in phosphodiester linkage, two nucleotides join.
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.