2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub 3-dimensional ob helix qauv ntawm DNA, raug elucidated los ntawm James Watson thiab Francis Crick.
Puas yog Rosalind Franklin nrhiav pom ob lub helix?
Hauv xyoo 1962, James Watson, Francis Crick thiab Maurice Wilkins tau txais qhov khoom plig Nobel rau kev tshawb pom ntawm cov qauv ntawm DNA. Qhov tseem ceeb tsis tuaj ntawm lub podium yog Rosalind Franklin, uas nws X-ray duab ntawm DNA tau pab ncaj qha rau kev tshawb pom ntawm ob lub helix.
Leej twg nrhiav tau ob lub helix Rosalind Franklin?
Ntawm King's College London, Rosalind Franklin tau txais cov duab ntawm DNA siv X-ray crystallography, ib lub tswv yim thawj zaug los ntawm Maurice Wilkins. Franklin cov duab tso cai James Watson thiab Francis Crick los tsim lawv cov npe nrov ob-strand, lossis ob-helix, qauv.
Puas yog Watson thiab Crick nyiag los ntawm Rosalind Franklin?
Kev sib deev hauv kev tshawb fawb: Puas yog Watson thiab Crick tiag tiag nyiag Rosalind Franklin cov ntaub ntawv? Yog lawm. Tus qhia meej meej tias lawv siv nws cov ntaub ntawv tsis tau tshaj tawm yam tsis muajnws tso cai lossis nws paub.
Watson thiab Crick ua li cas yuam kev?
Nws yog qhov tseeb tias qhov kev xav tias Watson thiab Crick tau tsim siv lawv cov qauv hlau-thiab-hlau tsis haum rau cov pov thawj muaj nyob hauv DNA. … Watson thiab Crick tus qauv yuam kev tso lub hauv paus rau sab nraud ntawm DNA molecule nrog cov phosphates, khi los ntawm magnesium los yog calcium ions, sab hauv.
Pom zoo:
Leej twg nrhiav tau Fayetteville xeev lub tsev kawm ntawv?
Fayetteville State University Keeb Kwm Fayetteville State tau tsim muaj xyoo 1867 thaum xya tus txiv neej dub tau them $ 136 rau ob qhov ntau hauv Fayetteville, North Carolina. Cov founders (David A. Bryant, Nelson Carter, Andrew J. Chesnutt, George Grainger, Matthew Leary.
Leej twg nrhiav tau lub nceeg vaj protista?
Antony van Leeuwenhoek feem ntau tau lees paub tias yog thawj tus neeg tshaj tawm pom cov neeg tawm tsam hauv xyoo 1675. Qhov tseeb, Leeuwenhoek yog thawj tus uas piav txog ntau cov kab mob hauv dej hauv dej. (protozoa, rotifers, thiab lwm yam), xa mus rau lawv li "
Leej twg nrhiav tau lub zais zis?
Nyob rau xyoo 1940, Francis Ernest Lloyd tau ua ntau yam kev sim nrog cov nroj tsuag carnivorous, suav nrog Utricularia, thiab txiav txim siab ntau lub ntsiab lus uas yav dhau los yog qhov kev xav. Leej twg pom cobra cog? Botanist Edward Barnes thawj zaug sau cov nroj tsuag no hauv xyoo 1932 los ntawm roob Nilgiri nyob rau sab qab teb Is Nrias teb.
Leej twg tau spayed thiab leej twg tau txais neutered?
Kev npam tus dev hais txog kev tshem tus poj niam dev lub cev xeeb tub, hos neutering yog hais txog cov txheej txheem uas ua rau txiv neej. Thaum tus poj niam tus dev tau spayed, tus kws kho tsiaj tshem nws zes qe menyuam thiab feem ntau nws lub tsev menyuam thiab.
Puas nrhiav tau lossis nrhiav tau?
Yog li, koj yuav tsum tau siv "could find". Lub modal verb, tau yog twb nyob rau hauv nws paste-form: ua. Yog li koj tsis tas yuav hloov pauv los nrhiav. Yuav nrhiav tau lossis nrhiav tau? "Ntaus" yog sib npaug. "
