Answer to Question #302301 in Genetics for drtfgyhujik

Question

Discuss the locations of each stage in protein synthesis, include exons, introns, splicing and amino acid activation. 

Answer 1

Transcription takes place in three steps: initiation, elongation, and termination. The steps are illustrated in the figure below.

1. Initiation is the beginning of transcription. It occurs when the enzyme RNA polymerase binds to a region of a gene called the promoter. This signals the DNA to unwind so the enzyme can “read” the bases in one of the DNA strands. The enzyme is ready to make a strand of mRNA with a complementary sequence of bases.
2. Elongation is the addition of nucleotides to the mRNA strand.
3. Termination is the ending of transcription. The mRNA strand is complete, and it detaches from DNA.