Question

1. which statement best describes the role of mrna in protein synthesis?

• stores the genetic code in the nucleus
• splits the dna molecule into two strands
• carries an amino acid to the ribosome
• copies the genetic code from the dna molecule and carries it to the ribosome

Explanation:

mRNA (messenger RNA) is synthesized via transcription, where it copies the genetic code from DNA in the nucleus, then transports this code to ribosomes in the cytoplasm to serve as a template for protein synthesis. Let's analyze each option:

• Storing genetic code in the nucleus is the role of DNA, not mRNA.
• Splitting DNA into two strands occurs during DNA replication/transcription initiation, and this is not the role of mRNA.
• Carrying amino acids to ribosomes is the function of tRNA (transfer RNA), not mRNA.
• The correct role of mRNA is copying the genetic code from DNA and delivering it to ribosomes.

Answer:

Copies the genetic code from the DNA molecule and carries it to the ribosome.