Question

........ carries the message for formation of polypeptide chain.

• A. r-RNA
• B. r-DNA
• C. m-RNA
• D. t-RNA

Hint:

mRNA carries the genetic code from DNA to the ribosome, where it directs the synthesis of proteins (polypeptides).

Answer 1

The Correct Option is C

Step 1: Understanding mRNA.
Messenger RNA (mRNA) is the RNA that carries genetic information from the DNA in the nucleus to the ribosomes in the cytoplasm, where polypeptides (proteins) are synthesized.
Step 2: Analyzing the options.
(A) r-RNA: Incorrect — Ribosomal RNA (rRNA) forms the core structure of the ribosome but does not carry the message for protein synthesis.
(B) r-DNA: Incorrect — rDNA refers to recombinant DNA, which is not involved in carrying messages for polypeptide formation.
(C) m-RNA: Correct — mRNA carries the genetic code for protein synthesis, which directs the formation of polypeptides.
(D) t-RNA: Incorrect — Transfer RNA (tRNA) helps in the translation process but does not carry the message for forming the polypeptide chain.
Step 3: Conclusion.
The correct answer is (C) m-RNA, as mRNA carries the genetic information for forming polypeptides.