Biology 1202B Lecture Notes - Lecture 7: Peptide, Ribosomal Rna, Ribosome
Document Summary
12. 1 the connection between dna, rna, and protein. 12. 1b the pathway from gene to polypeptide involves transcription and translation. The processes of transcription and translation are similar in prokaryotic and eukaryotic cells except: prokaryotic cells can transcribe and translate a given gene simultaneously. Eukaryotic cells transcribe and process mrna in the nucleus before exporting it to the cytoplasm for translation. Features of the genetic code: three-letter code, commaless, universal, degenerate, has start and stop signals. Products of transcription: mrna trna, rrna. 12. 3a eukaryotic protein-coding genes are transcribed into precursor mrnas that are modified in the nucleus processed in the nucleus to produce translatable mrna. A eukaryotic protein-coding gene is typically transcribed into a pre-mrna that must be. Once the pre-mrna has become mature mrna, it can exit the nucleus and enter the cytoplasm to be translated. The promoter regulates where, when and to what level a gene is expressed. It is the recognition site of rna polymerase.