Yam twg ruaj khov dua DNA lossis RNA?

Video: Yam twg ruaj khov dua DNA lossis RNA?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

DNA molecule ntau ruaj khov dua tshaj RNA vim qhov hloov ntawm URACIL pawg hauv RNA by THYMINE hauv DNA . Vim Thymine muaj kev tiv thaiv ntau dua rau Diam duab chemical Mutations ua Genetic message ruaj khov dua . Yog li Thymine muab ntau stability rau DNA qauv.

Hais txog qhov no, qhov twg yog qhov ruaj khov DNA lossis RNA?

1 . DNA yog tshuaj ruaj khov dua tshaj RNA . DNA yog resistant rau alkaline hydrolysis thaum RNA tsis yog. RNA yog susceptible rau alkaline hydrolysis vim ribose qab zib nyob rau hauv RNA muaj ib pawg hydroxyl ntawm 2' txoj hauj lwm, uas ua rau RNA tshuaj tsis ruaj tsis khov piv rau DNA ( DNA muaj hydrogen ntawm 2' txoj hauj lwm).

Ib yam li ntawd, nws puas muaj txiaj ntsig zoo uas DNA ruaj khov? Yog lawm. Nws muaj tag nrho cov ntaub ntawv xav tau los ntawm lub xov tooj ntawm tes rau nws cov qauv thiab kev ua haujlwm. Yog nws yog ruaj khov molecule, cov synthesis ntawm cov proteins yuav txuas ntxiv txawm tias tsis muaj qhov xav tau ntawm cov protein, uas ua rau lub zog siv hluav taws xob thiab ua pov thawj tias muaj teeb meem rau lub cell.

Yog li ntawd, vim li cas DNA ruaj khov dua RNA?

RNA muaj ribose qab zib puag thiab DNA muaj deoxyribose qab zib puag. DNA yog ruaj khov dua RNA vim DNA tsis muaj cov pab pawg hydroxyl (OH) ntawm 2 'carbon ntawm nws cov piam thaj hauv paus uas ribose muaj. Yog li ntawd, cov pab pawg neeg hydroxyl ntxiv renders RNA mas chemically reactive.

Qhov twg DNA molecule ruaj khov tshaj?

DNA tuaj yeem txais yuav ib qho ntawm ntau qhov sib txawv ob helix Cov qauv: cov no yog A, B thiab Z cov qauv ntawm DNA. Daim ntawv B, qhov ruaj khov tshaj plaws nyob rau hauv cellular mob, suav hais tias yog "tus qauv" daim ntawv; nws yog qhov koj ib txwm pom hauv cov duab kos.

Pom zoo:

PKa qis dua puas ruaj khov?

PKa zoo ib yam li pH hauv qhov qis (thiab txawm tias qhov tsis zoo) qhia txog cov kua qaub muaj zog. Tias yog vim li cas pKa yog raws li qhov sib npaug: Raws li qhov no, txhua yam uas stabilizes lub hauv paus conjugate yuav nce acidity. Yog li pKa kuj yog ib qho kev ntsuas ntawm qhov ruaj khov ntawm lub hauv paus conjugate

Tus conformer twg ruaj khov dua?

Nyob rau hauv cov nqe lus ntawm stability, lub staggered conformation yog ntau ruaj khov dua cov dab noj hnub. Qhov no yog vim ob yam: 1) Steric hindrance. Nyob rau hauv lub eclipsed conformation, qhov chaw ntawm lub atoms yuam lawv los ze zog ua ke, ua kom cov steric strain nyob rau hauv lub molecule

Dab tsi yuav ua rau txoj kev nqes hav ruaj khov dua?

Kev yaig, uas tau tsav los ntawm lub ntiajteb txawj nqus, yog qhov uas yuav tsum tau teb rau qhov kev txhawb nqa ntawd, thiab ntau hom kev yaig, nrog rau kev nkim loj, tau tsim cov slopes hauv thaj tsam uplifted. Txoj kab nqes kev ruaj ntseg yog qhov kawg txiav txim siab los ntawm ob yam: lub kaum sab xis ntawm txoj kab nqes thiab lub zog ntawm cov ntaub ntawv ntawm nws

Dab tsi tsis muaj qhov ntim ruaj khov lossis zoo li cas?

Cov roj yog ib yam khoom uas tsis muaj qhov ntim thiab tsis muaj qhov tseeb. Khoom thiab kua muaj ntim uas tsis hloov tau yooj yim. Ib qho roj, ntawm qhov tod tes, muaj qhov ntim uas hloov pauv kom haum rau qhov ntim ntawm nws lub thawv. Cov molecules nyob rau hauv ib tug roj yog sib nrug heev piv nrog rau cov molecules nyob rau hauv ib tug khoom los yog kua