Transcription is the process by which a strand of mRNA is produced using DNA as a template. Key steps include:
1) The promoter region activates transcription and RNA polymerase produces the mRNA strand.
2) The mRNA strand exits the nucleus through the nuclear pore.
3) The mRNA attaches to the ribosome where tRNAs read its codon sequences and add complementary amino acids.
4) The amino acids join together via peptide bonds to form a protein chain.