Video: Yog vim li cas trp operon suav hais tias yog ib tug repressible operon?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov tryptophan ( ua trp ) ua haujlwm system yog ib hom repressible operon qhov system. Thaum twg tryptophan yog tam sim no, nws khi cov ua trp repressor thiab induces ib tug conformational hloov nyob rau hauv cov protein, ua rau nws mus khi lub ua trp tus neeg teb xov tooj thiab tiv thaiv transcription ( ua haujlwm raug tsim txom).
Yog li ntawd, dab tsi yog tus repressor rau trp operon?
Tig lub ua haujlwm "on" thiab "tawm" Qhov kev nthuav dav ntawm DNA no tau lees paub los ntawm kev tswj hwm cov protein hu ua trp tiv . Thaum lub tus tsim txom khi rau DNA ntawm tus neeg teb xov tooj, nws khaws cov ua haujlwm los ntawm kev sau los ntawm lub cev tau txais hauv txoj kev ntawm RNA polymerase, cov enzyme transcription.
Ib yam li ntawd, qhov txawv ntawm ib qho operon repressible thiab inducible operon yog dab tsi? Cov trp ua haujlwm yog a tsim txom qhov system. Qhov tseem ceeb qhov sib txawv ntawm repressible thiab ua tsis taus pa systems yog qhov tshwm sim uas tshwm sim thaum lub effector molecule khi rau lub repressor. Cov lac ua haujlwm yog ib qho piv txwv ua tsis taus pa qhov system.
Tsis tas li ntawd, dab tsi yog qhov repressible operon?
Lwm yam cov neeg ua haujlwm feem ntau yog "on," tab sis tuaj yeem muab "tawm" los ntawm ib qho me me molecule. Lub molecule yog hu ua corepressor, thiab cov ua haujlwm yog hais tias yog tsim txom . Piv txwv li, trp ua haujlwm yog a repressible operon uas encodes enzymes rau synthesis ntawm cov amino acid tryptophan.
Vim li cas tus anabolic operon feem ntau yog Repressible?
Repressible operons feem ntau siv nyob rau hauv anabolic txoj hauv kev, vim tias cov khoom kawg tuaj yeem yog cov lus tawm tswv yim inhibitor ntawm transcription. Inducible cov neeg ua haujlwm Feem ntau siv rau hauv txoj kev catabolic, vim hais tias cov enzymes koom nrog hauv catabolism tsis tas yuav tsum tau ua ke tshwj tsis yog lawv cov substrates muaj.
Pom zoo:
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