Video: Vim li cas Watson thiab Crick kho lawv tus qauv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov hauv paus muaj cov ntaub ntawv genetic sib txawv ntawm tus nqi ntawm hom thiab hauv lawv kev npaj nyob rau hauv lub molecule. Cov pov thawj dab tsi tshwm sim Watson thiab Crick rau kho lawv cov qauv ? unwound, txhua strand yuav muab luam rau hauv ib tug complementary strand, ua ib tug tiag tiag replica ntawm tus thawj molecule.
Ib yam li ntawd, nws tau nug, dab tsi yog qhov tsis ncaj ncees lawm nrog Watson thawj DNA qauv?
Watson thiab Crick's qauv erroneously tso lub hauv paus rau sab nraum lub DNA molecule nrog cov phosphates, khi los ntawm magnesium los yog calcium ions, sab hauv. Ib qho ntawm cov yam ntxwv tseem ceeb ntawm kev tshawb fawb yog tias nws tso siab rau cov pov thawj.
Qhov thib ob, Watson thiab Crick lub tswv yim puas yog? Muab pov thawj ua ke: Watson thiab Crick Propose ob lub Helix. Qhov tseeb, Watson thiab Crick txhawj xeeb tias lawv yuav raug "scooped" los ntawm Pauling, leej twg npaj ib tug txawv qauv rau peb-dimensional qauv ntawm DNA tsuas yog lub hlis ua ntej lawv ua. Thaum kawg, txawm li cas los xij, Pauling qhov kev twv ua ntej tsis raug.
Ib yam li ntawd, vim li cas lwm hom molecule no zoo li tus neeg sib tw?
Watson thiab Crick xaus lus uas loj purine molecule (adenine los yog guanine) yeej ib txwm khi nrog ib tug me pyrimidine molecule (cytosine lossis thymine) - uas txoj kev, qhov kev ncua deb ntawm ob strands ntawm DNA yog ib txwm zoo ib yam.
Dab tsi cuam tshuam qhov kev tshawb pom ntawm DNA muaj nyob hauv tshuaj?
Cov nrhiav pom ntawm DNA thiab kev txheeb xyuas ntawm nws tus qauv yog ib qho tseem ceeb hauv kev tshawb fawb. Nws piav txog tus qauv uas ua tau siv rau cov cell hauv lub cev. Cov ntaub ntawv no tso cai kho mob cov kws tshawb fawb los txhim kho kev kho mob thiab kev sim raws li ntawm qhov kev paub no.
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