Vim li cas A thiab T thiab G thiab C ua khub hauv DNA ob lub helix?
Vim li cas A thiab T thiab G thiab C ua khub hauv DNA ob lub helix?

Video: Vim li cas A thiab T thiab G thiab C ua khub hauv DNA ob lub helix?

Video: Vim li cas A thiab T thiab G thiab C ua khub hauv DNA ob lub helix?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

Qhov no txhais tau tias txhua tus ntawm ob strandsin ob npaug - tso tseg DNA ua raws li tus qauv rau tsim ob txoj hlua tshiab. Replication relies oncomplementary puag ua khub , uas yog cov ntsiab lus piav qhia los ntawmChargaff cov cai: adenine (A) ib txwm khi nrog thymine ( T ) thiab cytosine ( C ) ib txwm khi nrog guanine ( G ).

Ib yam li ntawd, T khub nrog dab tsi hauv DNA?

Cov cai ntawm lub hauv paus ua khub (ornucleotide). ua khub ) yog: A nrog T : lub purine adenine(A) ib txwm khub nrog pyrimidine thymine ( T ) Cwith G: thepyrimidine cytosine (C) ib txwm khub nrog purine guanine (G)

Tom qab ntawd, lo lus nug yog, vim li cas DNA strands khiav ntawm qhov sib txawv? DNA strands khiav parallel rau ib leeg tab sis lawv muaj rov qab kev sib tw. Ib leeg DNA strand hastwoends. DNA ob helix yog nyob rau hauv oppositedirections vim o rov qab orientation ntawm cov piam thaj molecule inthem. Qhov kev npaj antiparallel no tso cai rau basepairs ntxiv rau lwm tus.

Ua kom pom qhov no, nws txhais li cas rau ob lub helix ntawm DNA kom muaj kev sib luag thiab sib ntxiv?

Tus qauv ntawm DNA yog npe a doublehelix , uas zoo li ib tug twisted staircase. Vim lub basepairing, lub DNA strands yog complementary toeachother, khiav nyob rau hauv opposite lus qhia, thiab yog hu ua antiparallel strands.

Vim li cas purines yuav tsum ua ke nrog pyrimidine?

Teb thiab piav qhia: Purines ua ke nrog pyrimidines ua vim tias lawv ob leeg muaj nitrogenousbases uas txhais tau hais tias ob qho tib si molecules muaj complementarystructures uas ua

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