Kev piav qhia: Cov enzymes xws li txwv tsis pub enzymes muaj kom paub txog cov kab ke tshwj xeeb txhawm rau ua nws txoj haujlwm. Nws khi rau DNA nkaus xwb hauv ib qho kev teeb tsa tshwj xeeb. … Ib kab lus palindromic kuj ua rau muaj feem uas ob txoj kab DNA raug txiav.
Palindromes cuam tshuam li cas rau kev txwv enzymes?
Txoj kev txwv enzymes txiav ob npaug-stranded DNA ntawm cov chaw tshwj xeeb raws li tus qauv ntawm cov hauv paus pom ntawm cov chaw ntawd. Cov enzymes no predictably txiav ob strands vim hais tias cov sequences lawv paubyog palindromic. Qhov ntawd yog qhov kev lees paub ua ntu zus yog cov hlua luv ntawm tib lub hauv paus ntawm ob qho tib si DNA strands.
Puas txwv tag nrho cov enzymes txiav palindromes?
Txhua qhov txwv tsis pub enzymes tshem lawv cov palindromic lees paub ua ntu zus asymmetrically, tawm hauv ib leeg-stranded overhang ntawm txhua sab ntawm qhov txiav (saib daim duab 4, sab saum toj). Ntawm txhua qhov muab enzyme lees paub qhov chaw cleavage, cov overhangs muaj qhov sib txawv thiab ua kom tiav.
Puas yog txhua qhov chaw txwv palindromes?
Txoj kev txwv-hloov kho yog siv los ua cov txheej txheem tiv thaiv tiv thaiv kev cuam tshuam tsis tsim nyog ntawm DNA txawv teb chaws. Cov kev lees paub ua ntu zus rau hom II txwv tsis pub enzymes thiab lawv cov methylases sib xws yog feem ntau palindromes.
txhais li cas thaum lub enzyme yog palindromic?
Ib kab lus palindromic yog tib yam rov qab thiab xa mus rau ob sab (saib duab hauv qab). Qhov no txhais tau hais tias lub enzyme paub qhov sib lawv liag tsis hais los ntawm sab twg lub enzyme mus rau DNAIb kab lus palindromic kuj ua rau muaj feem cuam tshuam rau ob qho tib si ntawm DNA raug txiav.
