Video: Dab tsi yog ib nrab ntawm DNA strand hu ua?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog li ntawd, DNA replication yog hu ua semiconservative. Lub sij hawm semiconservative hais txog qhov tseeb tias ib nrab ntawm tus thawj molecule (ib ob strands nyob rau hauv ob lub helix) yog "kev txuag" hauv qhov tshiab molecule.
Hauv qhov no, dab tsi yog ib nrab DNA strand hu ua?
Yog li ntawd, DNA replication yog hu ua semiconservative. Lub sij hawm semiconservative hais txog qhov tseeb tias ib nrab ntawm tus thawj molecule (ib ob strands nyob rau hauv ob lub helix) yog "kev txuag" hauv qhov tshiab molecule.
Tsis tas li ntawd, txhua qhov DNA strand sawv cev li cas? Txhua DNA strand ntawm ib tug progenitor cell ua hauj lwm raws li ib tug qauv rau synthesis ntawm ib tug tshiab complementary polynucleotide saw uas yog zoo ib yam li qhov qub cell. Cov txheej txheem no yog lub npe hu ua DNA rov ua dua.
Tom qab ntawd, lo lus nug yog, dab tsi yog ob kab ntawm DNA hu ua?
Cov ob lub DNA kuj yog lub npe hu ua polynucleotides raws li lawv yog tsim los ntawm yooj yim monomeric units hu ua nucleotides. Cov ob kab DNA khiav nyob rau hauv opposite lus qhia rau ib leeg thiab yog li antiparallel. Txuas rau txhua lub qab zib yog ib qho ntawm plaub hom nucleobases (tsis raug cai, hauv paus).
DNA strand zoo li cas?
Qhov no mitochondrial DNA yog ntau nyiam kab mob DNA - ib tug ntev, ncig daim DNA ua los ntawm ob strands ntawm DNA . A DNA strand yog ntev, nyias molecule -qhov nruab nrab tsuas yog hais txog ob nanometers (los yog ob billionths ntawm ib 'meter') nyob rau hauv dav. Qhov ntawd yog nyias, uas tib neeg cov plaub hau yog kwv yees li 40,000 zaug raws li dav.
Pom zoo:
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Lub teb chaws qhov ntsuas kub yog 2.91 ° C (5.24 ° F) saum toj no 1961-1990 qhov nruab nrab, tawg cov ntaub ntawv yav dhau los tau teev tseg hauv 2013 los ntawm 0.99 ° C (1.78 ° F)
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