Type of RNA that carries the protein-building instructions from the nucleus to the ribosomes

• A. tRNA
• B. rRNA
• C. DNA
• D. mRNA

Answer: (D)

Messenger RNA, or mRNA, carries the protein-building instructions from the nucleus to the ribosome. These instructions come from genes and are transcribed from DNA in the nucleus, then processed and transported to the cytoplasm. At the ribosome, the sequence of codons on mRNA is read to specify the order of amino acids in the growing polypeptide. tRNA brings the specific amino acids to the ribosome, matching its anticodons to the mRNA codons. rRNA is a component of the ribosome and helps catalyze peptide bond formation. DNA stores genetic information and serves as the template for transcription, but it is not the RNA that travels to the ribosome to direct protein synthesis.