Video: Cov txheej txheem ntawm cov kab mob hloov pauv yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov kab mob hloov pauv yog a txheej txheem ntawm kab rov tav hloov pauv hloov pauv los ntawm qee qhov kab mob nqa cov khoom siv txawv teb chaws (cov DNA liab qab) los ntawm ib puag ncig. Cov txheej txheem ntawm gene hloov los ntawm kev hloov pauv tsis tas yuav muaj lub cell pub dawb tab sis tsuas yog xav kom muaj DNA nyob hauv ib puag ncig.
Yog li ntawd, dab tsi yog cov kauj ruam ntawm kev hloov cov kab mob?
Ntsiab cov kauj ruam nyob rau hauv tus txheej txheem ntawm Cov kab mob hloov pauv : (1) muaj peev xwm npaj cell, (2) kev hloov pauv ntawm cell, (3) cell rov qab, thiab (4) cell plating.
Tsis tas li ntawd, ua li cas thaum lub sij hawm hloov pauv ntawm tes? a cell siv DNA los ntawm sab nraud cell tom qab ntawd cov DNA sab nraud dhau los ua ib feem ntawm cov cell cov DNA. ib lub noob uas ua rau nws muaj peev xwm ua kom cov kab mob uas muaj cov plasmid (thiab txawv teb chaws DNA) los ntawm cov uas tsis muaj.
Lub hom phiaj ntawm cov kab mob hloov pauv yog dab tsi?
Kev hloov pauv ntawm cov hlwb yog cov cuab yeej siv dav thiab ntau yam hauv kev tsim cov noob caj noob ces thiab yog qhov tseem ceeb hauv kev txhim kho molecular biology. Cov lub hom phiaj ntawm cov txheej txheem no yog los qhia ib qho txawv teb chaws plasmid rau hauv kab mob , cov kab mob tom qab ntawd amplifies lub plasmid, ua kom ntau ntawm nws.
Thaum tshav kub kub hloov pauv ua haujlwm li cas?
Hauv chav kuaj, cov kab mob hlwb tuaj yeem ua kom muaj peev xwm thiab DNA tom qab qhia los ntawm tus txheej txheem hu ua kub poob siab txoj kev. Kub poob siab transformation siv cov calcium nplua nuj ib puag ncig muab los ntawm calcium chloride los tiv thaiv cov electrostatic repulsion ntawm cov plasmid DNA thiab kab mob cellular membrane.
Pom zoo:
Dab tsi yog qhov txawv ntawm ib puag ncig kev hloov pauv thiab kev hloov pauv qub txeeg qub teg?
Qhov sib txawv ntawm cov yam ntxwv ntawm cov tib neeg ntawm tib hom yog hu ua variation. Qhov no yog inherited variation. Qee qhov kev hloov pauv yog qhov tshwm sim ntawm qhov sib txawv ntawm ib puag ncig, lossis ib tus neeg ua dab tsi. Qhov no yog hu ua environmental variation
Dab tsi yog qhov ua rau muaj kev hloov pauv hauv kev tswj cov txheej txheem txheeb cais?
'Ib qho laj thawj' kev hloov pauv yog qhov kev hloov pauv uas xav tias yuav muaj nyob rau hauv cov txheej txheem ruaj khov thiab feem ntau yog vim qhov yuam kev xws li kev kaw lossis ntsuas qhov yuam kev. Cov peev txheej ntawm qhov yuam kev no yuav tshwm sim tsis hais txog lwm yam, thiab yuav ua rau muaj qhov sib txawv me ntsis ntawm kev ntsuas
Dab tsi yog cov txheej txheem uas tsim cov ntawv luam tshiab ntawm cov kab mob caj ces?
Cov txheej txheem ntawm DNA replication tsim ib daim qauv tshiab ntawm cov kab mob cov ntaub ntawv caj ces kom dhau mus rau lub cell tshiab. Dawb ntab nucleotides yog txuam nrog lawv cov lus qhuas los ntawm ib qho enzyme hu ua polymerase. Cov no yog 'lub tsev.' Lawv sib sau ua ke DNA tshiab strand nrog txhua tus qub strands
Dab tsi yog cov kab mob piav qhia cov kab mob ntawm tes hauv kev nthuav dav?
Cov kab mob yog cov prokaryotes, tsis muaj cov nuclei zoo thiab cov kab mob sib txuas ua ke, thiab nrog cov chromosomes tsim los ntawm ib lub voj voog DNA kaw. Lawv tuaj nyob rau hauv ntau yam duab thiab ntau thiab tsawg, los ntawm feeb spheres, cylinders thiab kauv threads, rau flagellated rods, thiab filamentous chains
Dab tsi yog txheej txheem spontaneous thiab non-spontaneous txheej txheem?
Cov txheej txheem spontaneous yog ib qho uas tshwm sim yam tsis muaj kev cuam tshuam ntawm sab nraud. Ib txoj kev uas tsis yog tshwm sim yuav tsis tshwm sim yog tias tsis muaj kev cuam tshuam ntawm sab nraud