Which molecule can exit the nucleus to participate in protein synthesis?

Which molecule can exit the nucleus to participate in protein synthesis?

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

Answer: (B)

The key idea is that the genetic message must leave the nucleus to be read and used for building protein. In eukaryotic cells, DNA stays inside the nucleus, and a copy of its information is transcribed into messenger RNA. This messenger RNA is processed and then exits the nucleus through nuclear pores into the cytoplasm, where a ribosome reads its codons and translates them into a chain of amino acids to form a protein. While other RNA types like tRNA and rRNA are also involved in translation, they are part of the machinery or deliver amino acids rather than carrying the instruction from DNA to be read by the ribosome. So the molecule that exits the nucleus to participate in protein synthesis as the information carrier is the messenger RNA.

The key idea is that the genetic message must leave the nucleus to be read and used for building protein. In eukaryotic cells, DNA stays inside the nucleus, and a copy of its information is transcribed into messenger RNA. This messenger RNA is processed and then exits the nucleus through nuclear pores into the cytoplasm, where a ribosome reads its codons and translates them into a chain of amino acids to form a protein. While other RNA types like tRNA and rRNA are also involved in translation, they are part of the machinery or deliver amino acids rather than carrying the instruction from DNA to be read by the ribosome. So the molecule that exits the nucleus to participate in protein synthesis as the information carrier is the messenger RNA.