Video: Vim li cas purines sib cog lus nrog pyrimidines?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov nucleotides no yog complementary -lawv tus kheej ua rau lawv daim ntawv cog lus ua ke nrog hydrogen bonds. Hauv C-Gpair, lub tshuaj purine (guanine) muaj peb qhov chaw sib khi, thiab lwm yam ua tus pyrimidine (cytosine). Cov hydrogen kev sib raug zoo nruab nrab ntawm cov hauv paus ntxiv yog dab tsi tuav ob txoj hlua ntawm DNA ua ke.
Ua raws li qhov no, vim li cas purines thiab pyrimidines sib koom ua ke?
Cov qauv molecular ntawm ob qho tib si pyrimidines ua thiab cov purines cia lawv tsuas muaj peev xwm xwb sib cog lus thiab tsis nyob hauv pab pawg. Thymine ( pyrimidine )andenine ( tshuaj purine ) ob leeg muaj ob lub atoms uas tuaj yeem muab H daim ntawv cog lus los yog txais nws. Cytosine (pyr.) thiab guanine (pur.) tuaj yeem txhim kho peb H daim ntawv cog lus.
Tsis tas li ntawd, puas pyrimidines tsim covalent bonds nrog purines? Pyrimidine - pyrimidine kev sib tw ua tsis tshwm sim vim cov me me molecules ua tsis tau ze txaus rau daim ntawv hydrogen daim ntawv cog lus . Purine - tshuaj purine txuas ua tsis yog daim ntawv vim tias cov hauv paus no loj dhau kom haum rau hauv qhov chaw nruab nrab ntawm thepolynucleotide strands.
Ib yam li ntawd, nws tau nug, yuav ua li cas yog tias purines daim ntawv cog lus nrog purines?
Yog li ntawd, thaum ua khub hauv DNA, ob cov purines tsis tuaj yeem ua ke ua ke vim tias tsis muaj ntau qhov chaw txaus ntawm ob DNA helical strands kom haum rau ob tshuaj purine pab pawg, thiab yog li FOUR RINGS. Li no thaum DNApairing, a tshuaj purine ib txwm ua khub nrog apyrimidine.
Dab tsi ua purines ua ke nrog pyrimidines?
Lawv khub ua ke los ntawm kev ua tiav ua khub raws li Chargaff's Rule (A::T andG::C). Cov cov purines Hauv DNA yog adenine thiab guanine, tib yam hauv RNA pyrimidines ua Hauv DNA yog cytosine thiab thymine; hauv RNA, lawv yog cytosine thiab uracil.
Pom zoo:
Vim li cas purines sib cog lus nrog pyrimidines hauv DNA ntaiv?
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