Question

what is the role of mrna during translation?
a. it combines with proteins to form a ribosome, which holds and reads rrna.
b. it acts as a translator between the rrna sequence and a polypeptide.
c. it carries the genetic code for a protein out of the nucleus to the site of protein synthesis.
d. it carries single amino acids to the growing polypeptide chain.

Explanation:

mRNA (messenger RNA) is synthesized during transcription from DNA. Its key role is to carry the genetic information (the genetic code) that was transcribed from DNA out of the nucleus (in eukaryotes) to the ribosomes (the site of protein synthesis). Ribosomes read the mRNA sequence during translation.

• Option A: rRNA (ribosomal RNA), not mRNA, combines with proteins to form ribosomes.
• Option B: tRNA (transfer RNA), not mRNA, acts as a translator (by carrying amino - acids and having anticodons that pair with mRNA codons).
• Option D: tRNA carries single amino - acids to the growing polypeptide chain.

Answer:

C. It carries the genetic code for a protein out of the nucleus to the site of protein synthesis.