The excising of the introns from the mRNA and the adding of the poly A tail and guanine repeats to the mature mRNA so that it now exits the nucleus to begin translation.
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on the ribosomes in the cytoplasm of the cell
The first step in protein synthesis is called transcription. During transcription, the DNA sequence of a gene is used to create an mRNA molecule that carries the genetic information from the nucleus to the ribosome in the cytoplasm.
During transcription, an RNA molecule is built using a DNA template. This RNA molecule is an intermediate step in the process of protein synthesis.
Protein Synthesis
After DNA, the next step in protein synthesis is transcription. During transcription, a complementary RNA molecule called messenger RNA (mRNA) is synthesized from the DNA template in the cell nucleus. This mRNA carries the genetic information from the DNA to the ribosomes in the cytoplasm for translation.