Which among the following type of RNA is needed to synthesise a protein in a cell ?

All of these .

The correct answer is Option (4) – All of these .

All three types of RNA are essential for protein synthesis in a cell, but they play different roles:

1. mRNA (messenger RNA) - Carries the genetic code/instructions from DNA to the ribosome (required for protein synthesis).
2. rRNA (ribosomal RNA) - Forms the core structure of ribosomes where protein synthesis occurs.
3. tRNA (transfer RNA) - Delivers amino acids to the ribosome during translation (required to build the protein chain).

Correct Answer:

All three (mRNA, rRNA, and tRNA) are needed to synthesize a protein.

Key Points:

• mRNA provides the template (codon sequence).
• rRNA provides the ribosomal machinery.
• tRNA provides the amino acids (via anticodon-codon matching).