Which molecule carries the genetic message from the nucleus to the ribosome for protein synthesis?

Which molecule carries the genetic message from the nucleus to the ribosome for protein synthesis?

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

Answer: (B)

The main idea is the flow of genetic information: DNA is transcribed into RNA, and the RNA message is then read at the ribosome to assemble a protein. The molecule that carries that message from the nucleus to the ribosome is messenger RNA. It contains the codon sequence that specifies which amino acids should be added in which order during translation. Transfer RNA brings the amino acids to the growing chain, but it’s the mRNA that provides the instructions. Ribosomal RNA is a structural and catalytic component of the ribosome itself, not the carrier of the genetic code, and microRNAs regulate gene expression rather than transmitting the message to the ribosome. Therefore, the messenger RNA is the carrier of the genetic message.

The main idea is the flow of genetic information: DNA is transcribed into RNA, and the RNA message is then read at the ribosome to assemble a protein. The molecule that carries that message from the nucleus to the ribosome is messenger RNA. It contains the codon sequence that specifies which amino acids should be added in which order during translation. Transfer RNA brings the amino acids to the growing chain, but it’s the mRNA that provides the instructions. Ribosomal RNA is a structural and catalytic component of the ribosome itself, not the carrier of the genetic code, and microRNAs regulate gene expression rather than transmitting the message to the ribosome. Therefore, the messenger RNA is the carrier of the genetic message.