Dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon ntawm E coli?
Dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon ntawm E coli?

Video: Dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon ntawm E coli?

Video: Dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon ntawm E coli?
Video: Leng Yang - Yog Vim Dab Tsi (Official Full Song | Nkauj Tawm Tshiab) 2020/05/24 2024, Kaum ib hlis
Anonim

Lactose operon ntawm Escherichia coli. Cov noob lacZ, lacY thiab lacA tau sau los ntawm ib tus neeg txhawb nqa (P) uas tsim ib qho mRNA los ntawm qhov uas peb cov proteins raug txhais. Lub operon yog tswj los ntawm Lac repressor, cov khoom ntawm lacI noob, uas yog transcribed los ntawm nws tus kheej txhawb (PI).

Tib neeg kuj nug, qhov ua haujlwm ntawm lac operon hauv E coli yog dab tsi?

Lub lac operon ntawm E. coli muaj cov noob koom nrog hauv lactose metabolism . Nws tsuas yog qhia thaum muaj lactose thiab qabzib tsis muaj. Ob tus neeg tswj hwm tig lub operon "rau" thiab "tawm" hauv kev teb rau cov qib lactose thiab qabzib: lac repressor thiab catabolite activator protein (CAP).

Tsis tas li ntawd, qhov kev ua haujlwm ntawm lacZ gene quizlet yog dab tsi? Qhov no noob encodes ib qho enzyme, galactoside permease, uas thauj lactose mus rau hauv lub cell. Qhov no noob encodes ib qho enzyme, b-galactosidase, uas cleaves lactose rau hauv ob lub qabzib molecules. Qhov no noob encodes ib qho enzyme, b-galactosidase, uas cleaves lactose rau hauv qabzib thiab galactose.

Yog li ntawd, dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon?

Cov lac operon ua encodes cov noob tsim nyog kom tau thiab ua cov lactose los ntawm ib puag ncig hauv zos, uas suav nrog cov txheej txheem noob lacZ, lacY, thiab lacA. lacZ encodes β-galactosidase (LacZ), ib qho enzyme intracellular uas tshem tawm cov disaccharide. lactose rau hauv qabzib thiab galactose.

Lub luag haujlwm ntawm catabolite kev tawm tsam hauv lac operon yog dab tsi?

Catabolite kev tsim txom yog zoo tswj cov lac operon ua . Cov nyhuv yog qhov nce ntawm tus nqi ntawm transcription. Hauv qhov no, CAP protein yog qhib los ntawm cAMP los khi rau lub lac operon ua thiab pab txhawb txoj kev khi ntawm RNA polymerase rau tus txhawb nqa los sau cov noob rau lactose kev siv.

Pom zoo: