Video: DNA replication nrhiav tau li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Matthew Meselson thiab Franklin Stahl qhov kev sim ntawm qhov rov ua dua ntawm DNA , luam tawm nyob rau hauv PNAS nyob rau hauv 1958 (2), pab cemented lub tswvyim ntawm ob helix. Ob tug txiv neej tom qab lub zog ua haujlwm hauv cov kauj ruam nrhiav pom lub semiconservative rov ua dua ntawm DNA credit ntau ntawm lawv txoj kev vam meej rau lub sijhawm, kev ua haujlwm nyuaj, thiab kev ua siab ntev.
Ua li no, lawv nrhiav DNA li cas?
Lub Discovery ntawm DNA cov Qauv. Coj hauv xyoo 1952, daim duab no yog thawj daim duab X-ray ntawm DNA , uas coj mus rau kev tshawb pom ntawm nws cov qauv molecular los ntawm Watson thiab Crick. Tsim los ntawm Rosalind Franklin siv cov txheej txheem hu ua X-ray crystallography, nws tau nthuav tawm cov duab helical ntawm DNA molecule.
Kuj Paub, Dab tsi yog Semiconservative DNA replication Nws tau sim ua pov thawj li cas thiab los ntawm leej twg? Semiconservative DNA Replication yog ua pov thawj los ntawm kev ua haujlwm ntawm MATHEW MESSELSON thiab FRANKLIN STAHL (1958). Lawv loj hlob E. Coli nyob rau hauv ib qho nruab nrab uas muaj 15NH4Cl (15N yog qhov hnyav isotope ntawm Nitrogen) uas tsuas yog nitrogen qhov chaw rau ntau tiam neeg. Nws paub tseeb tias semiconservative hom ntawm rov ua dua.
Yog li ntawd, Semiconservative DNA replication pom tau li cas?
Hauv semiconservative kev xav, tawm tswv yim los ntawm Watson thiab Crick, ob lub ntsiab lus ntawm a DNA molecule cais thaum lub sij hawm rov ua dua . Txhua strand ces ua raws li ib tug template rau synthesis ntawm ib tug tshiab strand. Cov semiconservative hypothesis kwv yees tias txhua molecule tom qab rov ua dua yuav muaj ib qho qub thiab ib txoj hlua tshiab.
Watson thiab Crick nrhiav DNA li cas?
Watson thiab Crick ua hauj lwm ua ke ntawm kev kawm cov qauv ntawm DNA (deoxyribonucleic acid), cov molecule uas muaj cov ntaub ntawv keeb kwm ntawm cov hlwb. Lub sijhawm ntawd, Maurice Wilkins thiab Rosalind Franklin, ob leeg ua haujlwm ntawm King's College, London, tau siv X-ray diffraction los kawm. DNA.
Pom zoo:
Ua li cas koj thiaj nrhiav tau lub ntiajteb txawj nqus ntawm cov kua sib tov?
Tam sim no faib tag nrho qhov ceev los ntawm qhov ceev ntawm cov dej thiab koj tau txais SG ntawm qhov sib tov. Dab tsi yog cov kua uas muaj qhov ceev tshaj plaws? Thaum sib npaug ntawm ob yam khoom sib xyaw, qhov tshwj xeeb ntawm qhov sib tov yog 4. Ib qho loj ntawm cov kua ntawm qhov ntom ntom p yog tov nrog qhov sib npaug ntawm lwm cov kua ntawm qhov ntom ntom 3p
DNA ob lub helix nrhiav tau li cas?
Qhov Discovery ntawm DNA's Structure. Tsim los ntawm Rosalind Franklin siv cov txheej txheem hu ua X-ray crystallography, nws tau nthuav tawm cov duab helical ntawm DNA molecule. Watson thiab Crick pom tau hais tias DNA tau tsim los ntawm ob txoj hlua ntawm nucleotide khub uas encode cov ntaub ntawv caj ces rau txhua yam muaj sia
Dab tsi yog qhov yuav tsum tau rau DNA replication?
DNA tshiab yog tsim los ntawm enzymes hu ua DNA polymerases, uas yuav tsum tau ib tug template thiab ib tug primer (pib) thiab synthesize DNA nyob rau hauv lub 5' mus rau 3' kev taw qhia. DNA replication xav tau lwm yam enzymes ntxiv rau DNA polymerase, suav nrog DNA primase, DNA helicase, DNA ligase, thiab topoisomerase
Yuav ua li cas koj thiaj nrhiav tau tus nqi ntawm tus qauv txhais tau tias?
Qhov xav tau tus nqi ntawm tus qauv txhais tau tias yog cov pej xeem txhais tau tias, thiab SE ntawm tus qauv txhais tau tias yog SD ntawm cov pej xeem, muab faib los ntawm lub hauv paus square ntawm tus qauv loj
Henri Becquerel nrhiav tau dab tsi uas ua rau nws tau txais 1903 Nobel nqi zog Nws nrhiav tau dab tsi txog lub caij uranium?
Teb: Henri Becquerel tau txais ib nrab ntawm qhov khoom plig rau nws qhov kev tshawb pom ntawm cov hluav taws xob tsis zoo. Teb: Marie Curie tau kawm txog cov hluav taws xob ntawm tag nrho cov tebchaw uas muaj cov xov tooj cua paub, suav nrog uranium thiab thorium, uas nws tom qab pom kuj tseem muaj xov tooj cua