Video: DNA replication thiab sib cais nyob qhov twg?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ua li cas DNA replicated ? Replication tshwm sim nyob rau hauv peb cov kauj ruam loj: qhib ob lub helix thiab kev sib cais ntawm DNA strands, priming ntawm template strand, thiab lub rooj sib txoos ntawm cov tshiab DNA ntu. Thaum kev sib cais , ob lub qhov muag DNA ob chav helix uncoil ntawm ib qho chaw tshwj xeeb hu ua keeb kwm.
Yog li ntawd, qhov chaw twg DNA cais thiab rov ua dua tshiab yog dab tsi?
rov ua dua diav rawg. Cov qhov chaw uas DNA replication thiab kev sib cais tshwm sim hu ua. hydrogen bonds ntawm lub hauv paus khub yog tawg thiab ob strands ntawm lub molecule unwind.
Tsis tas li ntawd, dab tsi tshwm sim thaum lub molecule ntawm DNA yog unzipped? Thaum twg DNA yog unzipped , hydrogen bonds ntawm lub hauv paus khub yog tawg thiab ob strands ntawm lub molecule tso siab. Muaj tseeb tiag. Txhua DNA molecule uas tshwm sim los ntawm replication muaj ib tug thawj strand thiab ib tug tshiab strand.
Kuj paub yog, qhov twg DNA replication tshwm sim?
DNA replication tshwm sim nyob rau hauv lub cytoplasm ntawm prokaryotes thiab nyob rau hauv lub nucleus ntawm eukaryotes. Txawm nyob qhov twg DNA replication tshwm sim , cov txheej txheem hauv paus yog tib yam.
Vim li cas DNA replication tsuas yog tshwm sim hauv 5 mus rau 3 kev taw qhia?
Teb thiab piav qhia: DNA replication tsuas yog tshwm sim hauv 5' rau 3 ' kev taw qhia vim DNA polymerase yuav tsum tau dawb 3 ' hydroxyl pab pawg kom txuas cov nucleotide tshiab rau.
Pom zoo:
Yuav daws qhov tsis sib npaug ntawm cov kab sib npaug thiab cov kab sib npaug sib npaug li cas?
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Dab tsi yog qhov zoo sib xws thiab qhov sib txawv ntawm qhov nrawm thiab nrawm?
Kev sib piv daim duab piv rau Kev Sib Piv Ceev Ceev Tus Nqi Hloov ntawm qhov kev ncua deb Hloov pauv hloov thaum lub cev rov qab mus rau nws qhov chaw pib Yuav tsis xoom Yuav yog xoom Tsiv khoom Ceev ntawm cov khoom txav tsis tuaj yeem tsis zoo. Kev nrawm ntawm cov khoom txav tuaj yeem yog qhov zoo, tsis zoo lossis xoom
Dab tsi yog qhov txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv ntawm qhov ntab?
Integers thiab floats yog ob yam sib txawv ntawm cov ntaub ntawv tus lej. Ib tus lej (feem ntau hu ua anint) yog tus lej tsis muaj tus lej lej. Float isa floating-point number, uas txhais tau hais tias nws yog tus lej uas muaj tus lej lej. Floats siv thaum xav tau ntau dua
Dab tsi yog qhov sib txawv ntawm qhov sib txawv ntawm cov kab sib txuas thiab ntau qhov sib piv?
6. (2 lub cim) Qhov sib txawv ntawm cov kab sib txuas (kev sib piv) thiab ntau qhov sib piv yog dab tsi? Cov kab sib xyaw ua ke yog npaj sib piv; uas yog, tshwj xeeb txhais tau tias yog ua ke nyob rau hauv ntau txoj kev thiab contrasted nrog rau lwm yam kev sib txuas ntawm txhais tau tias
Dab tsi yog qhov sib txawv ntawm cov kab lus sib npaug thiab qhov sib npaug sib npaug?
Cov kab lus sib npaug muaj qhov muaj txiaj ntsig zoo ib yam tab sis tau nthuav tawm nyob rau hauv ib hom ntawv sib txawv uas siv cov khoom ntawm cov lej xws li ax + bx = (a + b) x yog cov kab lus sib npaug. nruj me ntsis, lawv tsis yog 'sib npaug', yog li peb yuav tsum siv 3 kab sib luag hauv 'sib npaug' es tsis yog 2 raws li qhia ntawm no