Question

Match the following.
(a) tRNA 1. Linking of amino acids
(b) mRNA 2. Transfer of genetic information
(c) rRNA 3. Nucleolar organising region
(d) Peptidyl transferase 4. Transfer of amino acid from cytoplasm of ribosome

• A. A- 4, B- 2, C- 3, D- 1
• B. A- 1, B- 4, C- 3, D- 2
• C. A- 1, B- 2, C- 3, D- 4
• D. A- 1, B- 3, C- 2, D- 4

Answer 1

Answer: (A)

A- 4, B- 2, C- 3, D- 1

There are three types of RNA with different functions. The tRNA carries a specific amino acid to the messenger RNA on the ribosomes to form a polypeptide. It forms the total 15% of the RNA of the cell. Its molecule is smallest of all the RNA types and is folded to assume the form of a cloverleaf.

The mRNA molecule is linear and carries the message or information from DNA about the sequence of particular amino acids to be joined to form a polypeptide. It forms 5% of the total RNA of the cell. It is the longest of all the RNA types.

The rRNA molecule is greatly coiled. In combination with proteins, it forms the small and large subunits or ribosomes. It forms about 80% of the total RNA of the cell.

The enzyme peptidyl transferase is an integral part of the large subunit of the ribosome and brings about the actual formation of the peptide bond between two adjacent amino acids. Thus it helps the linking of amino acids to form the polypeptide chain.

Thus, the correct answer is option A.