Q41 / 200 · MHT CET - Medical 2026 (22 April Shift 1) · Biology

Match List I with List II
List I (Binding site of ribosome)List II (Substances associated)
(A). P-site(I). Amino-acetyl tRNA
(B). A-site(II). Peptidyl tRNA
(C). E-site(III). Exit
Choose the correct answer from the options given below:

  • A
    (A) - (I), (B) - (II), (C) - (III)
  • Correct answer
    B
    (A) - (II), (B) - (I), (C) - (III)
  • C
    (A) - (III), (B) - (II), (C) - (I)
  • D
    (A) - (III), (B) - (I), (C) - (II)

Solution

The ribosome has three binding sites for tRNA during translation:

The P-site (peptidyl site) holds the tRNA carrying the growing polypeptide chain. Thus, (A) matches with (II).

The A-site (aminoacyl site) holds the tRNA carrying the next amino acid to be added to the chain. Thus, (B) matches with (I).

The E-site (exit site) is where discharged tRNAs leave the ribosome. Thus, (C) matches with (III).

The correct matching is (A) - (II), (B) - (I), (C) - (III).

Answer: (A) - (II), (B) - (I), (C) - (III)

Hence, the correct answer is option: 'B'.

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