Cov DNA ib ntus ntawm E. coli lac operon, lacZYA mRNA, thiab cov noob lacI muaj nyob ntawm GenBank (saib). … Lub lacI gene coding rau tus repressor nyob ze ntawm lub lac operon thiab yog ib txwm qhia (tsim).
LacI tswj hwm li cas?
Lub lac repressor yog encoded los ntawm lacI noob, nyob rau sab sauv ntawm lac operon thiab muaj nws tus kheej txhawb nqa. Kev nthuav qhia ntawm lacI noob tsis yog tswj hwm thiab qis heev ntawm cov lac repressor tau txuas ntxiv ua ke. Cov noob uas nws qhia tsis raug tswj yog hu ua cov noob caj noob ces.
Puas LacI dominant lossis recessive?
LacI constitutive mutants (LacI-) yog recessive rau hom tsiaj qus (LacI+), uas yog txhais raws li lub ntsiab lus uas LacI+ encodes ib tug transcriptional repressor thiab hais tias lub repressor muaj nuj nqi yog nullified los ntawm inducer.
Is LacI dominant?
Non-functional lacI is dominant vim nws tiv thaiv kev khi ntawm kev ua haujlwm lacI. Cov lacI tsis ua haujlwm tsis zoo yog rov ua haujlwm vim tias tsis ua haujlwm alleles ib txwm rov ua haujlwm. Tsis ua haujlwm lacI yog qhov tseem ceeb vim nws tshem tawm tag nrho cov haujlwm ntawm lac operon.
Puas yog cov tshuaj tiv thaiv cov protein tau hais tawm?
Tus lac repressor yog qhov tsim tawm thiab feem ntau khi rau thaj tsam ntawm tus neeg txhawb nqa, uas cuam tshuam nrog lub peev xwm ntawm RNA polymerase (RNAP) kom pib hloov pauv ntawm lac operon..
