Video: Ob chav Helix yooj yim yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Los ntawm Wikipedia, dawb encyclopedia. Hauv geometry, a ob helix (plural ob npaug helices) yog ob lub helices nrog tib axis, tab sis lawv txawv los ntawm kev txhais lus raws li axis. Lo lus feem ntau yog siv los hais txog cov nucleic acid ob helix , lub ntsiab qauv ntawm nucleic zoo li DNA thiab RNA.
Ib yam li ntawd, nws yog nug, dab tsi yog ob lub helix yooj yim txhais?
:ib helix los yog kauv uas muaj ob txoj hlua nyob rau saum npoo ntawm lub tog raj kheej uas coil ncig nws axis tshwj xeeb tshaj yog: kev teeb tsa ntawm DNA nyob rau hauv qhov chaw uas muaj cov khub polynucleotide strands stabilized los ntawm kev sib txuas ntawm purine thiab pyrimidine bases - piv alpha- helix , watson-crick qauv.
Ib tug kuj yuav nug, dab tsi ua rau ob lub helix? (Lub Ob chav Helix ) DNA yog ua li ntawm rau lub me me molecules - tsib carbon suab thaj hu ua deoxyribose, ib tug phosphate molecule thiab plaub txawv nitrogenous bases (adenine, thymine, cytosine thiab guanine). Cov rails ntawm tus ntaiv yog ua ntawm alternating qab zib thiab phosphate molecules.
Xav txog qhov no, vim li cas ob lub helix tseem ceeb?
Cov qauv tso cai rau DNA kom nruj nreem ntim rau hauv chromosomes. Nws kuj muab cov pob txha ruaj khov heev nrog cov phosphates tsis zoo uas taw tes rau sab nraud ntawm cov molecule. Qhov kev them nqi no pab rau kev txuas ntawm lwm cov molecules mus rau strand ntawm DNA.
Helix txhais li cas hauv DNA?
Cov duab coj los ntawm DNA molecule. A helix yog peb-dimensional kauv, zoo li cov duab ntawm lub caij nplooj ntoos hlav los yog lub railing ntawm ib tug kauv staircase. A DNA molecule muaj ob helixes intertwined.
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