A genetic toggle switch has Repressor A (inhibits Gene B, in…

A genetic toggle switch has Repressor A (inhibits Gene B, inactivated by IPTG) and Repressor B (inhibits Gene A, inactivated by heat). The system is currently in State A (high Repressor A, low Repressor B). What happens when a high concentration of IPTG is added?

Match each DNA repair mechanism listed below (top to bottom)…

Match each DNA repair mechanism listed below (top to bottom) with the type of DNA damage it primarily repairs. Repair Systems•    Methyl-directed mismatch repair•    Photoreactivation (photoactivation)•    Homologous recombination•    Base excision repair•    Nonhomologous end joining (NHEJ)•    SOS repair DNA Damage TypesA.    Thymine–thymine (T–T) dimers caused by UV lightB.    Chemically modified or damaged single basesC.    Error-prone repair of double-strand breaksD.    Replication errors producing base–base mismatchesE.    Error-proof repair of double-strand breaks F.    Global emergency response that allows translesion synthesis across damaged DNA

A mutant strain of coli lacks functional β-galactosidase (L…

A mutant strain of coli lacks functional β-galactosidase (LacZ) but still produces functional LacI repressor and LacY permease. The cells are grown in medium containing lactose but no glucose. What is the most likely effect on transcription from the lac operon?