Cellular Control. F215 control genomes and environment Module 1 Cellular Control and Meiosis. Learning outcomes. state that genes code for polypeptides, including enzymes; explain the meaning of the term genetic code ;
F215 control genomes and environment
Module 1 Cellular Control and Meiosis
CCT AGT ATT CGC TGA GGC TAA TG
Sunlight is intense enough to synthesis vit.D.
Light skin does not shield against harmful UV- causes skin cancer.
Vitamin D can be synthesisedEarly humans had dark skin
Melanin prevents sunlight synthesising vitamin D.
Sunlight less intense- lowered intensity of UV (no skin cancer)
Vitamin D can be synthesisedMigration to temperate climes
for lac operon
P: Promoter region. RNA polymerase binds here to start
transcription of Z & Y.
O: Operator region. Switches Z & Y on and off.
Z: Codes for ß-galactosidase.
Y: Codes for lactose permease.
Regulator gene is expressed and produces REPRESSOR PROTEIN.
One binding site on Repressor protein binds to operator region, covering promoter region where RNA polymerase would attach.
RNA polymerase cannot bind to promoter region and neither gene Z or Y is expressed.
Lactose binds to other binding site on repressor protein, changing the shape.
Repressor protein cannot bind to operator region
RNA polymerase binds to promoter region and genes Z & Y are expressed.