Yuav ua li cas cov nucleic acids sib sau ua ke?
Yuav ua li cas cov nucleic acids sib sau ua ke?

Video: Yuav ua li cas cov nucleic acids sib sau ua ke?

Video: Yuav ua li cas cov nucleic acids sib sau ua ke?
Video: Vaajtswv Lub Tebchaws/The Kingdom Of God - Nyaj Xuv Xyooj 2024, Kaum ib hlis
Anonim

Tag nrho RNA thiab DNA synthesis, ob leeg cellular thiab viral, ua rau tib yam tshuaj kev taw qhia : los ntawm 5' (phosphate) kawg mus rau 3' (hydroxyl) kawg (saib daim duab 4-13). Nucleic acid chains yog sib dhos los ntawm 5' triphosphates ntawm ribonucleosides los yog deoxyribonucleosides.

Ntawm no, qhov twg nucleic acid synthesis tshwm sim?

Synthesis ntawm nucleic acids . Nucleotides ua tau muab cais ua purines thiab pyrimidines. Nyob rau hauv ntau complex multicellular tsiaj lawv yog ob qho tib si feem ntau tsim nyob rau hauv lub siab.

Tsis tas li ntawd, txoj kev 5 mus rau 3 yog dab tsi? 2 Teb. Cov 5 ' thiab 3 ' txhais tau tias " tsib prime" thiab " peb prime", uas qhia cov lej carbon nyob rau hauv DNA lub qab zib qaum 5 ' carbon muaj ib pawg phosphate txuas rau nws thiab 3 ' carbon a hydroxyl (-OH) pawg. Qhov no asymmetry muab DNA strand ib " kev taw qhia ".

Kuj paub, nyob rau hauv txoj kev twg DNA replication tshwm sim?

Txhua tus paub DNA replication systems xav tau ib pab dawb 3 'hydroxyl ua ntej synthesis tuaj yeem pib (ceeb toom: lub DNA template yog nyeem hauv 3' txog 5' kev taw qhia whereas ib tug tshiab strand yog synthesized nyob rau hauv lub 5' rau 3' kev taw qhia -Qhov no feem ntau tsis meej pem).

Vim li cas DNA replication tshwm sim nyob rau hauv 5 mus rau 3 kev taw qhia?

DNA replication mus rau hauv 5' rau 3 ' kev taw qhia vim DNA Polymerase ua haujlwm rau ntawm lub cev 3 '-OH ntawm cov hlua uas twb muaj lawm rau kev ntxiv cov nucleotides dawb.

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