Which statement describes the central dogma sequence from DNA to protein?

Which statement describes the central dogma sequence from DNA to protein?

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

Answer: (A)

The main idea here is how genetic information is used to make functional products. In most cells, information encoded in DNA is first copied into RNA through transcription, creating a messenger RNA that carries the gene’s instruction sequence. Then, the ribosome reads that RNA during translation and assembles the corresponding sequence of amino acids to form a protein. So the flow of information is DNA to RNA to protein, which is why this sequence best describes how genes are expressed. Other directions don’t fit the usual process: starting with a protein would imply proteins directing the creation of nucleic acids, which isn’t how gene expression is organized; starting with RNA before DNA would bend the true sequence, since RNA templates come from DNA; and skipping transcription to go directly from DNA to protein leaves out this essential intermediate step. There are some exceptions in biology, but the standard pathway remains DNA to RNA to protein.

The main idea here is how genetic information is used to make functional products. In most cells, information encoded in DNA is first copied into RNA through transcription, creating a messenger RNA that carries the gene’s instruction sequence. Then, the ribosome reads that RNA during translation and assembles the corresponding sequence of amino acids to form a protein. So the flow of information is DNA to RNA to protein, which is why this sequence best describes how genes are expressed.

Other directions don’t fit the usual process: starting with a protein would imply proteins directing the creation of nucleic acids, which isn’t how gene expression is organized; starting with RNA before DNA would bend the true sequence, since RNA templates come from DNA; and skipping transcription to go directly from DNA to protein leaves out this essential intermediate step. There are some exceptions in biology, but the standard pathway remains DNA to RNA to protein.