The letter A shows the transcription process, while the letter B shows the translation process.
What do you mean by Translation?
The process of translation may be defined as by which a cell makes proteins using the genetic information carried in messenger RNA (mRNA).
The process of transcription occurs in the nucleus, while the process of translation occurs in the cytosol of the cell.
Therefore, the letter A shows the transcription process, while the letter B shows the translation process.
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