Vim li cas DNA khaws cov ntaub ntawv?
Vim li cas DNA khaws cov ntaub ntawv?

Video: Vim li cas DNA khaws cov ntaub ntawv?

Video: Vim li cas DNA khaws cov ntaub ntawv?
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Ua ntej, cov ntaub ntawv khaws cia rau hauv DNA molecule yuav tsum tau theej, nrog tsawg kawg yuam kev, txhua zaus ib celldivides. Qhov no ua kom ntseeg tau tias ob tus ntxhais lub hlwb tau txais txiaj ntsig tag nrho ntawm cov caj ces cov ntaub ntawv los ntawm niam txiv cell. Thib ob, lub cov ntaub ntawv khaws cia rau hauv DNA molecule yuav tsum tau txhais, los yog qhia.

Tib neeg kuj nug, DNA khaws cov ntaub ntawv li cas?

DNA khw lom cov ntaub ntawv insequences ntawm plaub lub hauv paus ntawm nucleic acid - adenine (A), thymine (T), cytosine (C) thiab guanine (G) - uas yog strungalong ribbons ntawm qab zib - phosphate molecules nyob rau hauv cov duab ntawm ob helix. Noj tag nrho, pob ntawm no DNA ua hauj lwm pab nws tus tswv qhov ua tiav cov txheej txheem caj ces.

Ib yam li ntawd, cov ntaub ntawv caj ces nyob qhov twg hauv DNA? Cov cov ntaub ntawv caj ces yog khaws cia nyob rau hauv lub chemical qauv ntawm lub DNA . Nws muaj ib tug txha caj qaum uas muaj suab thaj thiab phosphate. Txuas ob lub nraub qaum yog lub hauv paus. Cov hauv paus yog adenine (A), thymine (T), guanine (G), thiab cytosine (C).

Tsis tas li ntawd, vim li cas DNA thiaj li tsim nyog rau khaws cov ntaub ntawv?

Tsuas yog qee yam kab mob, DNA es tsis yog RNA nqa cov caj ces caj ces hauv txhua lub neej hauv ntiaj teb. DNA yog ob qho tib si zoo dua thiab kho tau yooj yim dua li RNA. Vim li ntawd, DNA ua hauj lwm raws li ib tug ntau ruaj khov ntawm cov noob caj noob ces cov ntaub ntawv uas yog qhov tseem ceeb ntawm kev muaj sia nyob thiab kev yug me nyuam.

DNA yog dab tsi?

DNA yog ua nce ntawm cov molecules hu ua nucleotides. Txhua nucleotide muaj ib pawg phosphate, ib pawg suab thaj thiab nitrogen hauv paus. Plaub hom nitrogen bases areadenine (A), thymine (T), guanine (G) thiab cytosine (C). Qhov kev txiav txim ntawm cov hauv paus no yog qhov txiav txim siab DNA cov cov lus qhia, orgenetic code.

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