複選題27.Choose the CORRECT statements describing the induction of B-galactosidase activity by isopropyl thiogalactoside (IPTG) in E coli. (A) IPTG stimulates the lac repressor funetion (B) IPTG induces the transcription of P-galactosidase. (C) IPTG binds is to the lac represso sor and i inhibits its activity. (D) IPTG inhibits β-galactosidase degradation. (E)The binding of lac repressor to the lac operator is suppressed by IPTG.