Dab tsi yog ob yam khoom ua rau lub caj qaum ntawm DNA molecule?
Dab tsi yog ob yam khoom ua rau lub caj qaum ntawm DNA molecule?

Video: Dab tsi yog ob yam khoom ua rau lub caj qaum ntawm DNA molecule?

Video: Dab tsi yog ob yam khoom ua rau lub caj qaum ntawm DNA molecule?
Video: Koj pom dab tsi? What do you see? 2024, Kaum ib hlis
Anonim

Cov lus teb kws tshaj lij

DNA, los yog Deoxyribonucleic Acid, yog ob lub helix, nrog lub pob txha caj qaum uas yog tsim los ntawm kev hloov cov molecules ntawm deoxyribose, tsib-carbon qab zib nrog cov tshuaj formula C5H10O4 thiab molecules ntawm phosphate , inorganic ntsev nrog cov mis PO4.

Yog li ntawd, dab tsi yog lub caj qaum ntawm DNA ua los ntawm?

DNA yog ua nce qab zib-phosphate qaum . Nws muaj 5-carbon deoxyribose qab zib thiab phosphate pawg. Cov suab thaj no txuas ua ke los ntawm phosphodiester daim ntawv cog lus, nruab nrab ntawm cov pa roj carbon 4 ntawm lawv cov saw, thiab CH2 pawg uas txuas nrog phosphate ion.

Ib sab saum toj no, dab tsi ua rau DNA molecule? DNA yog tsim los ntawm cov molecules hu ua nucleotides. Txhua nucleotide muaj phosphate pawg, ib pawg suab thaj thiab a nitrogen puag . Plaub yam ntawm nitrogen hauv paus yog adenine (A), thymine (T), guanine (G) thiab cytosine (C). Qhov kev txiav txim ntawm cov hauv paus no yog qhov txiav txim siab DNA cov lus qhia, lossis cov cai caj ces.

Raws li txoj cai, ob feem ntawm nucleotide ua rau cov pob txha?

Nucleotides thiab Bases. Cov suab thaj thiab phosphate pab pawg ua rau lub caj qaum ntawm lub DNA ob helix, thaum lub hauv paus yog nyob rau hauv nruab nrab. Ib qho tshuaj sib txuas ntawm pawg phosphate ntawm ib nucleotide thiab cov suab thaj ntawm cov nucleotide nyob sib ze tuav lub pob txha ua ke.

Dab tsi yog 3 yam tsim los ntawm nucleotide?

Lub nucleotide muaj peb yam: Lub hauv paus nitrogenous, uas tuaj yeem yog adenine, guanine, cytosine, lossis thymine (hauv RNA, thymine hloov los ntawm uracil). Ib tug tsib-carbon qab zib , hu ua deoxyribose vim nws tsis muaj cov pa oxygen ntawm ib qho ntawm nws cov carbons. Ib lossis ntau pawg phosphate.

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