Video: Yuav ua li cas eukaryotes ceev cov txheej txheem ntawm replication?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yuav ua li cas eukaryotes ceev cov txheej txheem ntawm replication - vim lawv muaj ntau yam chromosomes ntev? DNA yuav tsum "unzip" rau rov ua dua . DNA strands yog complementary.
Ua li no, DNA replication tshwm sim sai npaum li cas hauv eukaryotes?
Hauv kev sib piv, eukaryotic tshuaj tib neeg DNA replicates ntawm tus nqi ntawm 50 nucleotides ib ob. Hauv ob qho xwm txheej, rov ua dua tshwm sim sai sai vim tias ntau yam polymerases tuaj yeem sib txuas ob txoj hlua tshiab tib lub sijhawm los ntawm kev siv txhua qhov tsis muaj kab mob los ntawm qhov qub. DNA muab ob npaug rau helix ua tus qauv.
Qhov thib ob, lub xov tooj ntawm tes ua kom cov txheej txheem rov ua dua li cas? Ntxiv ntawm ntau eukaryotes complexes thiab qee qhov Rep ( rov ua dua enhancer proteins) ceev nce tus txheej txheem ua dna rov ua dua ua kom nws siv tau ntau dua rau peb… Ua kom ntau ntxiv rov ua dua diav rawg. Nce ntawm qhov tseem ceeb ntawm kev nyeem ntawv pov thawj txheej txheem hauv dna rov ua dua.
Qhov thib ob, dab tsi yog cov txheej txheem ntawm DNA replication hauv eukaryotes?
Eukaryotic DNA replication yog ib tug conserved mechanism uas txwv DNA replication mus rau ib zaug ib lub voj voog ntawm tes. Cov txheej txheem rov ua dua tso cai luam tawm ib zaug DNA muab ob npaug rau helix DNA helices, uas tau muab faib mus rau hauv cov ntxhais hlwb ntawm mitosis.
Cov txheej txheem replication yog dab tsi?
DNA rov ua dua yog cov txheej txheem los ntawm qhov uas ob-stranded DNA molecule yog theej los tsim ob lub DNA zoo tib yam molecules. Rov ua dua yog qhov tseem ceeb txheej txheem vim hais tias, thaum twg ib lub cell faib, ob lub cell tshiab yuav tsum muaj tib cov ntaub ntawv caj ces, lossis DNA, raws li niam txiv cell.
Pom zoo:
Yuav ua li cas cov txheej txheem ntawm cell faib nyob rau hauv eukaryotes feem ntau zoo ib yam li cell faib nyob rau hauv prokaryotes?
Tsis zoo li eukaryotes, prokaryotes (uas suav nrog cov kab mob) tau txais ib hom kev faib cell hu ua binary fission. Hauv qee qhov, cov txheej txheem no zoo ib yam li mitosis; Nws yuav tsum tau rov ua dua ntawm cov cell chromosomes, cais ntawm cov theej DNA, thiab kev sib cais ntawm niam txiv cell cytoplasm
Vim li cas nws yog ib lub tswv yim zoo los cawm tag nrho cov txheej txheem ntawm koj cov extraction kom txog thaum kawg ntawm kev sim?
Kev ua yuam kev thaum lub sijhawm rho tawm (piv txwv li nqa nrog cov txheej txheem tsis raug), tuaj yeem daws tau yog tias cov kev daws tsis tau muab tso rau hauv lub thawv pov tseg! Cov khaubncaws sab nraud povtseg yuav tsum tau txais kev cawmdim kom txog thaum tom qab evaporation vim hais tias cov khoom xav tau yuav tsis soluble heev hauv cov kuab tshuaj siv
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
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
Qhov nruab nrab ceev yog qhov ceev nruab nrab ntawm lub sijhawm. Instantaneous ceev yuav yog qhov ceev txhua qhov muab tam sim ntawd hauv lub sijhawm ntawd, ntsuas nrog lub ntsuas ntsuas lub sijhawm
Cov txheej txheem twg yog txheej txheem endothermic?
Cov txheej txheem endothermic yog ib qho txheej txheem uas xav tau lossis nqus lub zog los ntawm nws qhov chaw nyob ib puag ncig, feem ntau yog ua kom sov. Nws yuav yog cov txheej txheem tshuaj, xws li dissolving ammonium nitrate hauv dej, lossis cov txheej txheem ntawm lub cev, xws li melting ntawm cov dej khov nab kuab