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Biology · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 1 · Q24
(a) Explain the process by which amino acid gets attached to the tRNA molecule during translation process. (b) How does the translation process get…
(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 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.