Messenger RNA (mRNA), ribosomal RNA (rRNA), microRNA (miRNA), and transfer RNA (tRNA) each play distinct roles in gene expression and protein synthesis, crucial for exams like IIT JAM Biotechnology. This matching question tests core molecular biology concepts.

Correct Answer

The correct option is (A) P-3, Q-4, R-2, S-1. mRNA codes for proteins, rRNA forms the ribosome core and catalyzes synthesis, miRNA regulates post-transcriptional gene expression, and tRNA acts as an adaptor.

Group I and II Matches

• P. mRNA → 3. Codes for proteins: mRNA transcribes DNA genetic code and carries it to ribosomes as a template for polypeptide chains during translation.

• Q. rRNA → 4. Forms the core of the ribosome structure and catalyzes protein synthesis: rRNA provides structural framework for ribosomes and acts as a ribozyme via peptidyl transferase for peptide bonds.

• R. miRNA → 2. Regulates post-transcriptional gene expression: miRNA binds target mRNAs to inhibit translation or promote degradation, fine-tuning gene expression.

• S. tRNA → 1. Serves as adaptors between mRNA and amino acids during protein synthesis: tRNA anticodons pair with mRNA codons, delivering specific amino acids to the ribosome.

Option Analysis

• (A) Correct: All matches align precisely with standard functions as detailed above.

• (B) P-3, Q-4, R-1, S-2 Incorrect: Swaps miRNA (regulatory, not adaptor) and tRNA (adaptor, not regulatory).

• (C) P-4, Q-3, R-2, S-1 Incorrect: Misassigns mRNA (codes proteins, not ribosome) and rRNA (ribosome, not coding).

• (D) P-2, Q-1, R-4, S-3 Incorrect: Wrongly links mRNA to regulation (miRNA’s role) and disrupts all core assignments.

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