Arrange the following steps of translation in correct sequence.
A. The ribosome moves from codon to codon along the mRNA.
B. Formation of complementary base pairs with the tRNA anticodon.
C. Amino acids are added one by one and then translated into polypeptide sequences.
D. The ribosome binds to the mRNA at the start codon.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → D, B, A, C
(D) The ribosome binds to the mRNA at the start codon. — First. This is initiation. The ribosome binds at the start codon AUG, which only the initiator tRNA recognises.
(B) Formation of complementary base pairs with the tRNA anticodon. — Second. In elongation, each tRNA carrying its amino acid binds to the matching codon. It binds by pairing its anticodon with the codon.
(A) The ribosome moves from codon to codon along the mRNA. — Third. The ribosome moves on, bringing the next codon into place.
(C) Amino acids are added one by one and then translated into polypeptide sequences. — Fourth. As the ribosome moves, amino acids are joined one by one into the polypeptide. At the end, a release factor binds to the stop codon and the polypeptide is released.
NCERT Extract:
Translation – …
