Dab tsi yog ob chav helix hauv biology?
Dab tsi yog ob chav helix hauv biology?

Video: Dab tsi yog ob chav helix hauv biology?

Video: Dab tsi yog ob chav helix hauv biology?
Video: Paj Huab Vaj - Qhov Ntawm No Yog Dab Tsi (Official Music Video) NEW SONG 2024, Kaum ib hlis
Anonim

Cov ob helix yog ib qho kev piav qhia ntawm cov duab molecular ntawm a ob npaug - tso tseg DNA molecule. Cov ob helix piav txog qhov tsos ntawm ob npaug - tso tseg DNA , uas yog tsim los ntawm ob txoj kab ncaj nraim uas khiav tawm tsam ib leeg, los yog tiv thaiv kev sib luag, thiab sib tw ua ke.

Kuj paub, lo lus tseem ceeb ntawm ob lub helix txhais li cas?

Hauv molecular biology, lub term ob helix hais txog cov qauv tsim los ntawm ob npaug -stranded molecules ntawm nucleic acids xws li DNA . Cov ob npaug helical qauv ntawm nucleic acid complex tshwm sim raws li qhov tshwm sim ntawm nws cov qauv theem nrab, thiab yog qhov tseem ceeb hauv kev txiav txim siab nws cov qauv tertiary.

Tsis tas li ntawd, vim li cas DNA yog ob lub helix? Cov ob npaug - helix puab tso cai rau DNA replication thiab protein synthesis tshwm sim. Hauv cov txheej txheem no, cov twisted DNA unwinds thiab opens tso cai rau ib daim qauv ntawm cov DNA ua. Raws li cov ntaub ntawv tshiab, cov hauv paus yog ua ke ua ke kom txog rau thaum ob ob npaug - helix DNA molecules yog tsim los ntawm ib leeg ob npaug - helix DNA molecule.

Yog li, dab tsi yog ob thiab helical txog ob lub helix?

ob helix . Peb-dimensional qauv ntawm ob npaug - tso tseg DNA, nyob rau hauv uas polymeric nucleotide strands uas nws complementary nitrogen bases yog txuas los ntawm hydrogen bonds tsim ib tug helical kev teeb tsa. Ob DNA strands yog oriented nyob rau hauv opposite lus qhia.

Ob chav helix muaj dab tsi?

Ob chav Helix Txhua strand muaj lub nraub qaum ua los ntawm cov pab pawg suab thaj (deoxyribose) thiab phosphate pawg. Txuas rau txhua lub suab thaj yog ib qho ntawm plaub lub hauv paus: adenine (A), cytosine (C), guanine (G), lossis thymine (T).

Pom zoo: