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MODEL PAPER 4 — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMODEL PAPER 42 Marks
Question
Study the mRNA segment given below, which is complete and to be translated into a polypeptide chain and answer the following questions:
Image
i. Write codons 'A' and 'B'.
ii. What do they code for?
iii. How is the peptide bond formed between two amino acids in the ribosome?
✓

Answer

i. A-AUG, B-UAA/UAG/UGA
ii. AUG codes for methionine. UAA/UAG/UGA does not code for any amino acid, but brings about termination of polypeptide
synthesis.
iii. In the large subunit of ribosome, there are two sites in which subsequent amino acids bind to and come close enough for the formation of peptide bond. It is catalysed by the enzyme called peptidyl transferase.

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