The protein synthesis involves the following processes and they are transcription and translation.
The DNA is significant molecules to undergo transcription to produce mRNA from complimentary DNA strand, further mRNA under goes translation to produce proteins.
Thus, the options (d), (c) and (b) are incorrect.
The DNA is significant molecules to undergo transcription to produce mRNA from complimentary DNA strand, further mRNA under goes translation to produce proteins.
Therefore, the correct option is – a. transcription.