A newly synthesized polypeptide's signal sequence must direct it to the ER, from which it travels to the Golgi, in order for the cell to secrete it.
A messenger RNA molecule is produced during transcription utilizing DNA as a template. After the mRNA molecule leaves the nucleus, the translation process starts at a ribosome in the cytoplasm to create a polypeptide.
The cell builds proteins during translation by using an mRNA strand that it recently transcribed from its genetic code as a template. This just got transcribed by the cell.
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