DNA mRNA tRNA rRNA
I gave my students this multiple choice question: Every copy of a particular protein manufactured by a cell shows the same incorrect amino acid at the same point in its structure. According to the central dogma of molecular biology, in which structure does this error originate?

Only one answer is correct among these 4 choices:
- DNA
- mRNA
- tRNA
- rRNA

Could you tell me which one is correct?

DNA