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The amino acids brought in by tRNA are joined together by peptide bonds with the help of which molecule?
ArRNA
BmRNA
CDNA
DtRNA
Answer & Solution
Correct answer: A. rRNA
1. In translation, tRNA brings amino acids in the sequence dictated by mRNA codons.
2. These amino acids must be linked into a chain by peptide bonds.
3. The peptide bonds are formed with the help of rRNA inside the ribosome.
4. Therefore the correct molecule is rRNA.
5. Trap (mRNA): mRNA only carries the coded message; it does not form peptide bonds.
6. Trap (DNA): DNA stays in the nucleus and stores information; it does not bond amino acids.
7. Trap (tRNA): tRNA only delivers amino acids; the bonding itself needs rRNA.
8. So rRNA is the molecule that bonds the amino acids together.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 1 "Heredity and Evolution", p.11_
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