CBSE 2024 · Region 2 · Set 1 · Q24 · 3 marks
(a)Explain the process by which amino acid gets attached to the tRNA molecule during translation process.(b)How does the translation process get terminated ?(c)Expand 'UTR'. Where are they located ?
(a)
Explain the process by which amino acid gets attached to the tRNA molecule during translation process.
(b)
How does the translation process get terminated ?
(c)
Expand 'UTR'. Where are they located ?
Marking-scheme solution
(a)
Amino acids are activated in the presence of ATP, and linked to their cognate tRNA
– a process called charging of tRNA or aminoacylation of tRNA.
(b)
At the end of translation a release factor binds to the stop codon terminating
translation/ when ribosome moves to the stop codon (UAA/UAG/UGA) release factor binds to the stop codon terminating translation.
(c)
Untranslated regions (UTR) , UTRs are present at both $\displaystyle 5$′ – end (before start codon/
AUG) and at $\displaystyle 3$′ end (after stop codon) of mRNA.
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CBSE Class 12 Biology past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.