Video: Dab tsi yog lacI hauv lac operon?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tus yuam sij rau kev tswj cov ua haujlwm yog DNA-binding protein hu ua lac tus neeg ntxeev siab ( LacI ), qhia rau sab laug. Hauv qhov tsis muaj lactose , LacI inhibits kev qhia ntawm cov ua haujlwm los ntawm kev khi rau ob ntawm peb qhov chaw neeg teb xov tooj thiab ua rau DNA ntawm cov chaw sib khi mus rau hauv ib lub voj.
Ntawm no, yog LacI ib feem ntawm lac operon?
Lub gene uas encodes lub lac repressor npe lacI , thiab nyob rau hauv kev tswj ntawm nws tus kheej txhawb nqa. Cov lacI gene tshwm sim kom pom nyob ze ntawm lac operon ua , tab sis nws tsis yog ib ib feem ntawm ua haujlwm thiab qhia nyias. Thaum twg lactose yog tsis muaj, cov lac repressor khi nruj nreem rau tus neeg teb xov tooj.
Tsis tas li ntawd, lac operon hauv E coli yog dab tsi? Cov lac operon ua (Lactose ua haujlwm ) yog ib ua haujlwm xav tau rau kev thauj thiab metabolism ntawm lactose nyob rau hauv Escherichia coli thiab ntau lwm yam enteric kab mob . Cov noob khoom ntawm lacZ yog β-galactosidase uas cleaves lactose, disaccharide, rau hauv qabzib thiab galactose.
Ua li no, lac operon yog dab tsi thiab nws ua haujlwm li cas?
Cov lac , los yog lactose , ua haujlwm muaj nyob rau hauv E. coli thiab lwm yam kab mob enteric. Qhov no ua haujlwm muaj gene coding rau cov proteins nyob rau hauv tus nqi thauj lactose mus rau cytosol thiab zom nws mus rau hauv qabzib. Cov piam thaj no tom qab ntawd siv los ua kom muaj zog.
Lac Y ua dab tsi?
Lub duo tau sau tseg tias lac operon muaj peb lub noob uas encode cov proteins koom nrog hauv lactose metabolism. Cov no yog hu ua lac z, lac y, thiab lac a. Lub lac z gene encodes beta-galactosidase, lub lac y noob encodes ib permease, thiab lub lac a gene encodes transacetylase enzyme.
Pom zoo:
Yog vim li cas trp operon suav hais tias yog ib tug repressible operon?
Lub tryptophan (trp) operon system yog ib hom repressible operon system. Thaum tryptophan tam sim no, nws khi lub trp repressor thiab induces ib tug conformational hloov nyob rau hauv cov protein, ua rau nws khi tus neeg teb xov tooj trp thiab tiv thaiv transcription (operon yog repressed)
Lac operon qauv yog dab tsi?
Lub lac operon (lactose operon) yog ib qho operon xav tau rau kev thauj thiab metabolism ntawm lactose hauv Escherichia coli thiab ntau lwm cov kab mob enteric. Cov noob khoom ntawm lacZ yog β-galactosidase uas cleaves lactose, disaccharide, rau hauv qabzib thiab galactose
Dab tsi ua rau lac operon?
Cov qauv ntawm lac operon Lub lac operon muaj peb lub noob: lacZ, lacY, thiab lacA. Cov noob no tau muab sau ua ib qho mRNA, raws li kev tswj hwm ntawm ib tus neeg txhawb nqa. Cov noob hauv lac operon qhia cov proteins uas pab lub cell siv lactose
Kev siv lac operon yog dab tsi?
Cov lac, los yog lactose, operon muaj nyob rau hauv E. coli thiab lwm yam kab mob enteric. Qhov no operon muaj cov noob coding rau cov proteins uas thauj cov lactose rau hauv cytosol thiab zom nws mus rau hauv qabzib. Cov piam thaj no tom qab ntawd siv los ua kom muaj zog
Dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon ntawm E coli?
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 peb cov proteins raug txhais. Lub operon yog tswj los ntawm Lac repressor, cov khoom ntawm lacI noob, uas tau sau los ntawm nws tus kheej txhawb nqa (PI)