Video: Vim li cas DNA thiaj suav tias yog cov khoom siv caj ces?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tsuas yog qee yam kab mob, DNA es tsis yog RNA nqa cov noob caj noob ces caj ces code nyob rau hauv tag nrho cov biological lub neej nyob rau hauv lub ntiaj teb no. DNA yog ob qho tib si zoo dua thiab kho tau yooj yim dua li RNA. Vim li ntawd, DNA ua hauj lwm raws li ib tug ntau ruaj khov cab kuj ntawm cov cov ntaub ntawv caj ces uas yog qhov tseem ceeb rau kev ciaj sia thiab kev yug me nyuam.
Ib sab ntawm qhov no, vim li cas DNA hu ua cov khoom siv caj ces?
Zoo, koj genetic khoom paub raws li deoxyribonucleic acid ( DNA ) yog vim li cas. DNA yog tus xeeb ntxwv khoom pom nyob rau hauv lub nucleus ntawm eukaryotic hlwb (tsiaj thiab nroj tsuag) thiab lub cytoplasm ntawm prokaryotic hlwb (cov kab mob) uas txiav txim seb lub cev muaj pes tsawg leeg.
Ib sab saum toj no, dab tsi yog pov thawj tias DNA yog cov khoom siv caj ces? 3 Hershey thiab Chase's Experiment (1952) Ntxiv mus pov thawj tias DNA yog cov khoom siv caj ces los ntawm kev sim ua los ntawm Hershey thiab Chase. Cov kws tshawb fawb no tau kawm txog kev sib kis ntawm caj ces cov ntaub ntawv nyob rau hauv tus kab mob hu ua T2 bacteriophage, uas siv Escherichia coli ua nws tus tswv tsev kab mob (Daim duab 1.4).
Yog li ntawd, vim li cas DNA thiaj suav tias yog cov khoom siv caj ces tsis yog cov protein?
Ntau tus kws tshawb fawb niaj hnub xav tias nws yog protein ntau vim tias muaj 20 qhov sib txawv ntawm cov amino acids los tsim ib qho protein ntau polymer, thaum DNA polymers yog tsim los ntawm tsuas yog plaub nucleotide bases.
Vim li cas DNA suav tias yog cov khoom siv caj ces zoo dua li RNA?
DNA tau poob ib pawg 'hydroxyl' hauv nws 'ribose qab zib', piv rau RNA . Qhov no tsuas yog qhov sib txawv ua DNA ib tug nyiam cov khoom siv caj ces dhau RNA vim:i) DNA yog ruaj khov - RNA molecules muaj cov pab pawg hydroxyl uas ploj lawm DNA . RNA yog ib qho 'single stranded molecule' uas yooj yim dua rau degradation.
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Yog vim li cas sodium poov tshuaj twj tso kua mis suav hais tias yog ib qho kev thauj mus los uas cov kev taw qhia yog cov sodium thiab poov tshuaj tau pumped?
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Leej twg tau pom tias DNA yog cov khoom siv caj ces ntawm t2 phage?
Hershey thiab Chase tau ua ntau qhov kev sim ua qauv qhia tias DNA yog cov khoom siv caj ces ntawm T2 phage
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus
Vim li cas qhov ntom ntom suav tias yog cov khoom siv tshuaj lom neeg?
Cov cuab yeej tshuaj lom neeg yog cov cuab yeej uas piav qhia nws muaj peev xwm ua rau tshuaj lom nrog lwm yam tshuaj thiab yog li qhov ceev tsis yog tshuaj lom neeg. Qhov ntom yog qhov ntau ntawm qhov loj ntawm ib yam uas muab faib los ntawm nws qhov ntim