BIL 150 Lecture Notes - Lecture 25: Cellular Differentiation, Chromatin, Genomic Imprinting
Document Summary
What components form the transcription complex at a eukaryotic promoter: rna polymerase ii (second, transcription factors (first) How and where are the modification made to eukaryotic mrna before it goes to the cytosol: splicing in the nucleus snrnps are small ribonucleoproteins that take out the introns. What are the parts of the ribosomes: e: exit, p: makes peptide bonds into rna, a: amoacteyl rna binding site. Aminoacyl t rna synthetase is an enzyme that binds amino acid to trna in the cytoplasm. Operons: a cluster of functionally related genes can be under coordinated control by a single on and off switch, stretch of dna, operator, promoter, genes that operator and promoter control. 2 types of operon: repressible, usually on, shut off by the binding of a repressor to operator, ex: trp operon. Inducible: usually off, activated by an inducer that inactivates the repressor, ex: lac operon, genes that code for the enzymes in lactose.
