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Biology · 2025 · 3 marks
CBSE 2025 · Region 7 · Set 1 · Q24
A segment of DNA, 'TTG AGG GGG ATG' was translated into an oligopeptide with the amino acids, Lysine - Serine - Proline - Tyrosine. (a) Write the…
A segment of DNA, 'TTG AGG GGG ATG' was translated into an oligopeptide with the amino acids, Lysine - Serine - Proline - Tyrosine.
(a)
Write the codons in correct sequence for the four amino acids.
(b)
If first adenine in DNA is substituted by guanine, what will be the sequence of amino acids in the new oligopeptide ?
(c)
Write the anticodons for these amino acids.
Marking-scheme solution
(a)
Lysine – Serine – Proline – Tyrosine
AAC UCC CCC UAC
(b)
Lysine – Proline – Proline – Tyrosine
(c)
UUG AGG GGG AUG /
UUG GGG GGG AUG
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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.