ORF yog dab tsi thiab nws txiav txim siab li cas?
ORF yog dab tsi thiab nws txiav txim siab li cas?

Video: ORF yog dab tsi thiab nws txiav txim siab li cas?

Video: ORF yog dab tsi thiab nws txiav txim siab li cas?
Video: Dab ntxwg nyoos yog leej twg ...zaj no zoo heev. 2024, Kaum ib hlis
Anonim

Hauv cov noob caj noob ces molecular, ib qhib kev nyeem ntawv ( ORF ) yog ib feem ntawm kev nyeem ntawv uas muaj peev xwm muab txhais. Ib ORF yog qhov txuas txuas ntxiv ntawm codons uas pib nrog pib codon (feem ntau AUG) thiab xaus ntawm qhov nres codon (feem ntau UAA, UAG lossis UGA).

Ua raws li qhov no hauv kev txiav txim siab, koj pom ORF li cas hauv ib ntu?

Thawj qhov kev nyeem ntawv yog tau los ntawm kev xav txog qhov ib ntus nyob rau hauv cov lus ntawm 3. Lwm 3 qhov kev nyeem ntawv tuaj yeem nrhiav tau tsuas yog tom qab nrhiav qhov rov qab ntxiv. 4. Txheeb xyuas tus qhib kev nyeem ntawv ( ORF ) - ib ntus stretch pib nrog pib codon thiab xaus rau hauv ib qho stopcodon.

6 daim ntawv nyeem yog dab tsi? Qhib nyeem ntawv is stretches of DNA that donot contains stop codons (UAA, UGA, UAG). Ib ntu ntawm ob-stranded DNA muaj rau ua tau nyeem ntawv , peb nyob rau hauv txhua txoj kev.

Ntxiv mus, dab tsi txiav txim siab qhov kev nyeem ntawv?

Cov nyeem ntawv ncej uas yog siv txiav txim uas amino acids yuav encoded los ntawm ib tug noob. Ib zaug qhib nyeem ntawv ncej paub tias DNA ib ntus tuaj yeem muab txhais ua nws cov amino acid sib lawv liag. Ib qho qhib nyeem ntawv pib nrog atg (Met) hauv ntau hom thiab xaus nrog astop codon (taa, tag lossis tga).

Puas yog codons nyeem ntawm 5 mus rau 3?

Cov codons tau sau 5' rau 3 ', raws li lawv tshwm sim hauv mRNA. AUG is an initiation codon ; UAA, UAG, and UGA is termination (stop) codons.

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