Video: Dab tsi yog hauv ib txoj kab ntawm DNA?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ib feem ntawm a DNA Strand
Nucleotides lawv tus kheej muaj peb qhov sib koom ua ke: cov suab thaj molecule, phosphate pawg, thiab nitrogenous puag. Cov suab thaj ntawm ib nucleotide txuas mus rau phosphates ntawm cov nucleotide uas nyob ib sab los tsim rau sab nrauv DNA strand , hu ua qab zib-phosphate qaum.
Ntxiv mus, dab tsi yog nyob rau hauv ib txoj hlua ntawm DNA?
DNA yog tsim los ntawm chemical tsev blocks hu ua nucleotides. For form a strand ntawm DNA , nucleotides txuas rau hauv cov saw hlau, nrog cov phosphate thiab qab zib pawg hloov pauv. Plaub hom nitrogen hauv paus pom hauv nucleotides yog: adenine (A), thymine (T), guanine (G) thiab cytosine (C).
Tom qab ntawd, lo lus nug yog, hom DNA twg uas feem ntau pom hauv lub cell? Nyob rau hauv tib neeg lub hlwb, feem ntau DNA yog pom nyob rau hauv ib tug compartment nyob rau hauv lub cell hu ua a nucleus . Nws yog lub npe hu ua nuclear DNA. Ntxiv nrog rau DNA DNA, me me ntawm DNA hauv tib neeg thiab lwm yam kab mob nyuaj kuj tuaj yeem pom hauv mitochondria. Cov DNA no hu ua mitochondrial DNA (mtDNA).
Tom qab ntawd, lo lus nug yog, pes tsawg tus strands hauv DNA?
Tib neeg lub hlwb muaj 23 khub ntawm chromosomes (46 chromosomes tag nrho). Txhua chromosome yog tsim los ntawm 2 strands ntawm DNA khi los ntawm hydrogen-bonds rau ib leeg ua tus classic DNA ob helix (ob-stranded DNA ). Yog li, tag nrho muaj 46 * 2 = 92 strands ntawm DNA nyob rau hauv txhua diploid tib neeg cell!
Dab tsi yog qhov qub DNA strand?
DNA yog ua los ntawm ib tug ob helix ntawm ob complementary strands . Thaum lub sij hawm replication, cov no strands sib cais. Txhua txoj hlua ntawm Original DNA molecule ces ua tus qauv rau kev tsim khoom ntawm nws cov counterpart, txheej txheem hu ua semiconservative replication.
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