Which molecule copies information from DNA to direct protein synthesis?

Which molecule copies information from DNA to direct protein synthesis?

• A. DNA
• B. mRNA
• C. RNA
• D. Chlorophyll

Answer: (B)

Messenger RNA carries the genetic message from DNA to the ribosome, where it directs protein assembly. This happens after transcription, when the DNA code is copied into a complementary mRNA strand in the nucleus. The mRNA then exits to the cytoplasm and, at the ribosome, its codons specify the order of amino acids to build a protein. DNA, while it stores the information, isn’t the molecule that directly directs protein synthesis. RNA is a broader category that includes other RNA types like rRNA and tRNA, which have roles in the ribosome and during translation but do not carry the DNA code to the ribosome. Chlorophyll has no part in gene expression; it’s a pigment involved in photosynthesis.

Messenger RNA carries the genetic message from DNA to the ribosome, where it directs protein assembly. This happens after transcription, when the DNA code is copied into a complementary mRNA strand in the nucleus. The mRNA then exits to the cytoplasm and, at the ribosome, its codons specify the order of amino acids to build a protein. DNA, while it stores the information, isn’t the molecule that directly directs protein synthesis. RNA is a broader category that includes other RNA types like rRNA and tRNA, which have roles in the ribosome and during translation but do not carry the DNA code to the ribosome. Chlorophyll has no part in gene expression; it’s a pigment involved in photosynthesis.