Thaum nucleotides koom ua ke rau hauv DNA, cov nucleotides uas nyob ib sab txuas los ntawm a phosphodiester bond: covalent bond yog tsim los ntawm 5 'phosphate pawg ntawm ib nucleotide thiab 3'- OH pab pawg ntawm lwm tus (saib hauv qab). Hauv qhov no, txhua txoj hlua ntawm DNA muaj "ncaj qaum" ntawm phosphate-qab zib-phosphate-qab zib-phosphate.
Yuav ua li cas cov ntawv cog lus nyob hauv nucleotides?
Txhua nucleotides muaj cov qauv sib xws: pawg phosphate txuas los ntawm a phosphoester daim ntawv cog lusrau pentose (tsib-carbon qab zib molecule) uas nyob rau hauv lem yog txuas mus rau ib tug organic puag. (Daim duab 4-1a). Hauv RNA, lub pentose yog ribose; hauv DNA, nws yog deoxyribose (Daim duab 4-1b).
Yuav ua li cas tsis pom muaj nyob hauv nucleic acids?
Ionic thiab covalent bonds tsis tshwm sim ntawm nitrogenous hauv paus hauv DNA. Covalent daim ntawv cog lus pom muaj nyob rau hauv DNA caj qaum (lub npe hu ua phosphodiester bonds).
Nws tsis yog ib feem ntawm nucleotide?
Qhov twg hauv qab no tsis yog ib feem ntawm cov qauv nucleotide? C yog lawm. Peb lub ntsiab ntawm nucleotide yog 5-carbon qab zib, phosphate pawg, thiab nitrogenous puag. Ib nucleotide tsis muaj phospholipids; cov no yog cov molecules uas tsim cov cell membrane thiab lub hnab ntawv nuclear.
4 hom nucleotides yog dab tsi?
Vim tias muaj plaub lub hauv paus tshwm sim nitrogenous, muaj plaub hom DNA nucleotides: adenine (A), thymine (T),guanine (G), thiab cytosine (C).
