Nyob hauv e coli tus neeg teb xov tooj gene ua ke nrog?

Cov txheej txheem:

Nyob hauv e coli tus neeg teb xov tooj gene ua ke nrog?
Nyob hauv e coli tus neeg teb xov tooj gene ua ke nrog?
Anonim

Raws li lub tswv yim lac operon, tus neeg teb xov tooj gene ua ke nrog. Co-repressor txhawm rau hloov pauv cov txheej txheem cov noob.

Dab tsi yog operon tsim los ntawm?

Ib tug raug operon muaj ib pawg ntawm cov txheej txheem genes uas code rau enzymes koom teshauv txoj kev metabolic, xws li biosynthesis ntawm cov amino acid.

Tus neeg teb xov tooj yog dab tsi?

Tus neeg teb xov tooj yog kab mob caj ces uas tso cai rau cov proteins lub luag haujlwm rau kev hloov pauv mus txuas rau DNA ntu. Cov noob, lossis cov noob, uas tau sau tseg thaum tus neeg teb xov tooj raug khi yog hu ua operon.

Yuav ua li cas muaj lac operon?

Lub lac operon muaj peb yam qauv: lacZ, uas codes rau β-galactosidase, uas ua rau cleave lactose rau hauv galactose thiab qabzib; lacY, uas yog codes rau lac permease, uas yog ib tug transmembrane protein tsim nyog rau lactose uptake; thiab lacA, uas yog codes rau transacetylase uas hloov ib pawg acetyl…

Yuav ua li cas cov enzymes ua lac operon tsim?

Peb ntawm cov enzymes rau lactose metabolism yog pab pawg hauv lac operon: lacZ, lacY, thiab lacA (Daim duab 12.1. 1). LacZ encodes ib qho enzyme hu ua β-galactosidase, uas zom lactose rau hauv nws ob lub suab thaj: qabzib thiab galactose. lacY yog ib qho permease uas pab hloov lactose mus rau hauv lub cell.

Pom zoo:

Nthuav cov khoom
Thaum twg tus menyuam ya mus?
Nyeem ntxiv

Thaum twg tus menyuam ya mus?

Fledglings feem ntau pib sim ya thaum cov noog muaj kwv yees li ob lub lis piam, thiab txawm tias lawv tau pib tawm hauv lub zes, lawv tsis nyob ntawm lawv tus kheej, raws li cov Massachusetts Audubon Society. Cov niam txiv feem ntau nyob ze, saib xyuas lawv cov xeeb ntxwv thiab tseem muab zaub mov.

Ntau npaum li cas 99 chinning osrs?
Nyeem ntxiv

Ntau npaum li cas 99 chinning osrs?

Feem ntau, rau 99 ntau yam, koj xav tias yuav siv sijhawm 40+ hnub kev cob qhia siv hlau lossis hlau riam phom. Tab sis kuj ceeb tias, txoj kev no raug nqi txog 30M-55Mnrog rune xub lossis mithril ntuav riam. Ntxiv rau, koj tuaj yeem ua tiav 60-99 ntau yam hauv tsawg li 15 hnub.

Dab tsi yog qhov txawv ntawm lub tshuab hluav taws xob thiab lub tshuab hluav taws xob?
Nyeem ntxiv

Dab tsi yog qhov txawv ntawm lub tshuab hluav taws xob thiab lub tshuab hluav taws xob?

Gramophone: Txhua lub suab kaw suab, lossis cov cuab yeej ua si yav dhau los-cov suab kaw, tshwj xeeb tshaj yog tias nws siv lub tiaj tiaj tiaj. Phonograph: Txhua lub suab kaw suab, lossis cov cuab yeej siv rau kev ua si cov suab uas tau kaw dhau los, tshwj xeeb tshaj yog tias nws siv lub tog raj kheej tig.