Qhov Tseem Ceeb Qhov Sib Txawv - Qhov Zoo vs Cov Kev Cai Tsis Txaus Siab
Kev tswj noob caj noob ces yog txheej txheem ntawm kev tswj cov noob uas tau nthuav tawm hauv cov hlwb DNA. Los ntawm kev tswj cov noob qhia, cov hlwb tuaj yeem tswj kev tsim cov protein ua haujlwm hauv cov hlwb. Qee cov noob tau qhib thaum qee qhov raug tua raws li qhov yuav tsum tau ua. Kev tswj cov noob tuaj yeem ua tau pib los ntawm kev muaj DNA, tsim tawm ntawm mRNA mus rau kev ua cov protein. Cov noob sib txawv yog tswj hwm ntawm cov ntsiab lus sib txawv hauv cov noob qhia; Piv txwv li, chromatin qauv kev cai, qib transcriptional, thiab RNA ua theem, thiab lwm yam. Kev tswj cov noob zoo thiab tsis zoo yog ob txoj kev tswj cov noob caj noob ces uas cov noob tau nthuav tawm, thiab cov noob raug txwv, feem. Qhov sib txawv tseem ceeb ntawm qhov zoo thiab qhov tsis zoo ntawm cov noob qhia yog tias nyob rau hauv kev tswj cov noob zoo, qhov kev hloov pauv hloov pauv mus rau tus txhawb nqa ntawm cov noob thiab ua kom yooj yim rau kev khi ntawm RNA polymerase los sau cov noob thaum nyob rau hauv kev tswj cov noob tsis zoo, cov tshuaj tiv thaiv protein khi nrog tus neeg teb xov tooj. cov gene thiab tiv thaiv gene qhia.
Txoj Cai Noob Neej Zoo yog Dab Tsi?
Kev txhais lus yog thawj kauj ruam ntawm cov noob qhia. Nws tsuas yog tshwm sim thaum RNA polymerase txuas nrog cov noob. Yog tias qhov kev txuas no ua tsis tiav, kev qhia gene tsis tuaj yeem ua tau; li no, gene qhia tuaj yeem tswj tau. Kev sib txuas ntawm RNA polymerase nrog DNA yog tshwm sim los ntawm cov txheej txheem hloov pauv tam sim no hauv lub nucleus. Ib qho kev hloov pauv yog ib qho protein uas yog ib feem tseem ceeb ntawm cov noob qhia. Qhov tseem ceeb no yuav tsum khi nrog rau thaj tsam txhawb nqa ntawm cov noob kom qhib cov noob qhia los ntawm kev nrhiav RNA polymerase rau cov qauv DNA. Kev hloov pauv tuaj yeem ua haujlwm ib leeg lossis nrog lwm cov proteins los tswj tus nqi ntawm cov noob qhia los ntawm kev txhawb lossis thaiv RNA polymerase enzyme, uas ua rau cov khoom sib txuas mRNA.
Kev tswj cov noob zoo yog cov txheej txheem uas tsav cov noob los qhia thiab tsim cov protein uas lawv tau encoded. Nws tshwm sim los ntawm kev sib txuas ntawm qhov kev hloov pauv mus rau tus neeg txhawb nqa thiab nrhiav RNA polymerase los pib sau ntawv. cAMP-CRP complex yog ib qho activator rau kev tswj zoo ntawm β -galactosidase noob.
Daim duab 01: Txoj Cai Zoo Gene
Neegative Gene Regulation yog dab tsi?
Gene kev qhia tuaj yeem thaiv los ntawm qee cov proteins uas muaj nyob hauv hlwb. Lawv ua raws li inhibitors ntawm cov noob ua kom. Lawv hu ua repressor proteins. Ib tug repressor yog ib tug protein uas khi rau tus neeg teb xov tooj qhov chaw ntawm cov noob los yog txhawb nqa thiab nres cov transcription. Yog li ntawd, kev tswj hwm cov noob tsis zoo yog cov txheej txheem uas cov noob raug tiv thaiv los ntawm kev nthuav tawm thiab tsim cov protein. Kev khi ntawm cov protein repressor rau hauv cheeb tsam txhawb nqa ntawm cov noob inhibits cov noob los ntawm kev thaiv cov RNA polymerase thaum pib. Cov noob caj noob ces tuaj yeem qhia tau los ua cov protein tsuas yog thaum tsis muaj tus neeg tawm tsam. Tryptophan yog ib qho kev tawm tsam uas muaj feem cuam tshuam nrog kev tswj hwm cov noob tsis zoo.
Daim duab 02: Cov Kev Cai Tsis Zoo Gene
Dab tsi yog qhov txawv ntawm Txoj Cai Zoo thiab Tsis Zoo?
Zoo vs Negative Gene Regulation |
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| Kev tswj cov noob zoo yog txheej txheem uas ua rau cov noob nthuav tawm thiab tsim cov proteins. | Neegative gene regulation is a process uas represses gene expression. |
| Kev tswj tau zoo yog ua los ntawm tus neeg ua haujlwm lossis tus lej hloov pauv nrog rau thaj tsam txhawb nqa. | Kev tswj tsis zoo yog ua tiav los ntawm kev tawm tsam cov protein khi rau tus txhawb nqa lossis tus neeg teb xov tooj ntawm cov noob. |
| Nrhiav RNA Polymerase | |
| RNA polymerase raug xaiv los pib sau. | RNA polymerase tsis raug xaiv los pib sau. |
Summary – Positive vs Negative Gene Regulation
Cells muaj lawv cov ntaub ntawv caj ces raws li cov noob zais hauv DNA. Genes nthuav qhia thiab tsim cov proteins, thiab cov txheej txheem no hu ua gene qhia. Txawm li cas los xij, gene qhia tau tswj hwm hauv cov hlwb kom tsis txhob nkim lub zog thiab cov khoom siv raw hauv kev sib txuas ntawm cov protein uas tsis xav tau. Kev tswj cov noob tuaj yeem ua tau ob txoj hauv kev: kev tswj cov noob zoo thiab tsis zoo. Hauv kev tswj hwm cov noob zoo, cov noob tau nthuav tawm vim yog kev sib txuas ntawm qhov hloov pauv mus rau tus txhawb nqa ntawm cov noob. Hauv kev tswj hwm cov noob tsis zoo, cov noob tsis tau nthuav tawm vim yog kev sib txuas ntawm cov tshuaj tua kab mob rau cov neeg ua haujlwm ntawm cov noob. Qhov no yog qhov sib txawv tseem ceeb ntawm kev tswj cov noob zoo thiab tsis zoo.
