Video: Dab tsi ua rau lac operon?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov qauv ntawm cov lac operon ua
Cov lac operon ua 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. Genes nyob rau hauv lac operon ua qhia cov proteins uas pab lub cell siv lactose.
Ua li no, lac operon tsim dab tsi?
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.
Ib yam li ntawd, puas muaj lac operon nyob hauv tib neeg? Cov neeg ua haujlwm muaj ntau yam kab mob, tab sis lawv tsis tshua muaj nyob rau hauv eukaryotes xws li tib neeg . Feem ntau, ib ua haujlwm yuav muaj cov noob uas ua haujlwm hauv tib txoj kev. Piv txwv li, ib qho kev kawm zoo ua haujlwm hu ua lac operon ua muaj cov noob uas encode cov protein uas koom nrog hauv kev nqus thiab cov metabolism ntawm ib qho qab zib, lactose.
Tom qab ntawd, muaj pes tsawg lub ntsiab lus muaj nyob hauv lac operon?
Cov lac operon ua muaj 3 yam txheej txheem noob caj noob ces, thiab ib tug txhawb nqa, ib tug terminator, regulator, thiab tus neeg teb xov tooj. Peb lub hom phiaj yog: 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 Lac A yog dab tsi?
Cov no yog hu ua lac z, lac y,ua lac ib . Cov lac z gene encodes beta-galactosidase, cov lac y gene encodes ib permease, thiab cov lac ib gene encodes lub transacetylase enzyme. Ua ke, cov khoom lag luam no ua rau cov lactose tuaj yeem nkag mus rau hauv cov hlwb thiab ua rau nws siv los ua khoom noj.
Pom zoo:
Yuav ua li cas yuav tsum tshwm sim rau transcription ntawm lac operon?
Dab tsi ntawm cov hauv qab no yuav tsum tshwm sim rau kev hloov pauv ntawm cov noob lac operon coj qhov chaw? Cov protein repressor khi rau DNA molecule, thiab RNA polymerase poob. Lactose raug tshem tawm ntawm lub cev. Lub repressor protein poob tawm ntawm DNA molecule, thiab RNA polymerase khi rau tus txhawb nqa
Dab tsi yog lacI hauv lac operon?
Ib qho tseem ceeb ntawm kev tswj cov operon yog DNA-binding protein hu ua lac repressor (LacI), qhia rau sab laug. Thaum tsis muaj lactose, LacI inhibits qhov kev qhia ntawm operon los ntawm kev khi rau ob ntawm peb tus neeg teb xov tooj qhov chaw thiab ua rau DNA ntawm qhov chaw khi rau hauv lub voj voog
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
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)