Txoj cai ntawm kev sib koom ua ke (lossis nucleotide pairing) yog: A nrog T: cov purine adenine (A) ib txwm ua khub nrog pyrimidine thymine (T) C nrog G: cov pyrimidine cytosine (C) ib txwm ua khub nrog purine guanine (G)
Puas tau ob lub hauv paus purine ua khub ua ke?
Ob purines thiab ob pyrimidines ua ke tsuas yog siv ntau qhov chaw kom haum rau qhov chaw nruab nrab ntawm ob txoj hlua. … Cov khub uas tuaj yeem tsim cov ntawv cog lus hydrogen hauv qhov chaw ntawd yog adenine nrog thymine thiab cytosine nrog guanine. A thiab T tsim ob daim ntawv cog lus hydrogen thaum C thiab G tsim peb.
Yuav ua li cas yog tias ib qho purine ua ke nrog lwm tus purine?
Yog li ntawd, thaum ua khub hauv DNA, ob purines tsis tuaj yeem ua ke ua ke vim tias muajtsis muaj chaw txaus txaus ntawm ob DNA helical strands kom haum rau ob pawg purine, thiab yog li FOUR RINGS. Li no thaum DNA ua khub, ib qho purine ib txwm ua ke nrog pyrimidine.
Vim li cas purines tsis ua ke nrog purines?
Chargaff txoj cai hais tias, paj khub tsuas yog ua tau ntawm purine thiab pyrimidinehauv DNA ob lub helix. Tsis muaj purine-purine lossis pyrimidine-pyrimidine puag paring ua tau hauv DNA. Purines yog lub hauv paus loj nitrogenous vim yog ob lub nplhaib nitrogen hauv lawv cov qauv.
Puas purines ib txwm ua khub nrog lwm cov purines?
Vim purines ib txwm khi nrog pyrimidines - paub tias yogcomplementary pairing - qhov piv ntawm ob yuav ib txwm nyob tas mus li hauv DNA molecule. Nyob rau hauv lwm yam lus, ib tug strand ntawm DNA yuav yeej ib txwm yog ib tug meej ntxiv ntawm lwm yam kom deb li deb purines thiab pyrimidines mus.
