What is the correct sequence described by the central dogma?

What is the correct sequence described by the central dogma?

• A. DNA -> RNA -> Protein
• B. RNA -> DNA -> Protein
• C. DNA -> Protein -> RNA
• D. Protein -> RNA -> DNA

Answer: (A)

Information stored in DNA is transcribed into RNA, and the RNA is then translated into a protein. This DNA → RNA → Protein sequence is the basic flow described by the central dogma, showing how genetic information is expressed: transcription copies the DNA into mRNA, and translation uses that mRNA to build the protein. The other sequences would misrepresent the usual flow. For example, starting from RNA and moving to DNA implies reverse transcription as the normal direction, which is not the standard pathway described by the central dogma. Skipping transcription to go directly from DNA to protein skips the essential step that creates the mRNA template. And a sequence beginning with protein would not reflect how information stored in genes is first converted into a readable template. In special cases like certain viruses, reverse transcription can occur, but that is an exception rather than the typical flow described by the central dogma.

Information stored in DNA is transcribed into RNA, and the RNA is then translated into a protein. This DNA → RNA → Protein sequence is the basic flow described by the central dogma, showing how genetic information is expressed: transcription copies the DNA into mRNA, and translation uses that mRNA to build the protein.

The other sequences would misrepresent the usual flow. For example, starting from RNA and moving to DNA implies reverse transcription as the normal direction, which is not the standard pathway described by the central dogma. Skipping transcription to go directly from DNA to protein skips the essential step that creates the mRNA template. And a sequence beginning with protein would not reflect how information stored in genes is first converted into a readable template. In special cases like certain viruses, reverse transcription can occur, but that is an exception rather than the typical flow described by the central dogma.