Video: Erwin Chargaff nrhiav tau dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Erwin Chargaff tau npaj ob txoj cai tseem ceeb hauv nws lub neej uas tau tsim nyog muaj npe Chargaff cov txoj cai. Thawj qhov kev paub zoo tshaj plaws yog los qhia tias nyob rau hauv ntuj DNA tus naj npawb ntawm guanine units sib npaug ntawm cov cytosine units thiab tus naj npawb ntawm adenine units sib npaug ntawm cov thymine units.
Ua raws li qhov no hauv kev xav, vim li cas Erwin Chargaff nrhiav tau qhov tseem ceeb?
Tus American biochemist Erwin Chargaff (Yug 1905) nrhiav pom tias DNA yog lub hauv paus tseem ceeb ntawm cov noob, yog li pab tsim ib txoj hauv kev tshiab rau kev kawm txog biology ntawm heredity. Chargaff cov feem ntau tseem ceeb Kev pab rau biochemistry yog nws txoj haujlwm nrog deoxyribonucleic acid, feem ntau hu ua DNA.
Tsis tas li ntawd, Erwin Chargaff ua haujlwm nrog leej twg? Erwin Chargaff, uas nws cov kev tshawb fawb rau hauv cov tshuaj muaj pes tsawg leeg ntawm DNA pab nteg lub hauv paus rau James Watson thiab Francis Crick's Kev tshawb pom ntawm nws cov qauv ob-helix - qhov tseem ceeb ntawm kev tshawb pom ntawm 20th-xyoo pua biology - tuag thaum Lub Rau Hli 20 hauv tsev kho mob New York. Nws yog 96.
Ib sab ntawm no, thaum twg Erwin Chargaff ua nws qhov kev tshawb pom?
Xyoo 1949, Chargaff nrhiav pom tias qhov kev faib ua feem ntawm cov hauv paus hauv DNA nyob ntawm cov hom DNA los ntawm.
Watson thiab Crick nrhiav tau dab tsi?
Watson thiab Crick ua haujlwm ua ke ntawm kev kawm txog cov qauv ntawm DNA (deoxyribonucleic acid), cov molecule uas muaj cov ntaub ntawv keeb kwm ntawm cov hlwb. Thaum lub Plaub Hlis 1953, lawv tau tshaj tawm cov xov xwm ntawm lawv qhov kev tshawb pom, cov qauv molecular ntawm DNA raws li tag nrho nws cov yam ntxwv paub - ob lub helix.
Pom zoo:
Archimedes yog leej twg thiab nws nrhiav tau dab tsi?
Archimedes, (yug c. 287 bce, Syracuse, Sicily [Italy]-tuag 212/211 bce, Syracuse), tus kws ua lej nto moo tshaj plaws thiab tus tsim khoom hauv tebchaws Greece thaum ub. Archimedes yog qhov tseem ceeb tshwj xeeb rau nws qhov kev tshawb pom ntawm kev sib raug zoo ntawm qhov chaw thiab ntim ntawm ib puag ncig thiab nws lub tog raj kheej ncig
Erwin Chargaff pab txhawb dab tsi rau kev tshawb pom DNA?
Los ntawm kev sim ua tib zoo, Chargaff tau tshawb pom ob txoj cai uas tau pab coj mus rau kev tshawb pom ntawm ob chav helix qauv ntawm DNA. Thawj txoj cai yog hais tias nyob rau hauv DNA tus naj npawb ntawm guanine units yog sib npaug zos rau cov cytosine units, thiab tus naj npawb ntawm adenine units yog sib npaug zos rau cov thymine units
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
Erwin Chargaff paub txog dab tsi?
Chargaff cov cai
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