Dab tsi enzyme rhais cov DNA sib lawv liag rau hauv mRNA?
Dab tsi enzyme rhais cov DNA sib lawv liag rau hauv mRNA?

Video: Dab tsi enzyme rhais cov DNA sib lawv liag rau hauv mRNA?

Video: Dab tsi enzyme rhais cov DNA sib lawv liag rau hauv mRNA?
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Anonim

Thaum lub sijhawm sau ntawv, DNA ntawm cov noob ua haujlwm ua tus qauv rau kev sib koom ua ke ntawm kev sib koom ua ke, thiab ib qho enzyme hu ua RNA polymerase II catalyzes qhov tsim ntawm pre-mRNA molecule, uas yog tom qab ntawd ua tiav los ua mRNA paub tab (Daim duab 1).

Tom qab ntawd, ib tug kuj yuav nug, uas strand ntawm DNA yog transcribed rau hauv mRNA?

Lub stretch ntawm DNA tau sau rau hauv RNA molecule hu ua a kev sau ntawv unit thiab encodes yam tsawg kawg ib gene. Yog hais tias lub gene encodes ib tug protein, lub kev sau ntawv tsim cov tub txib RNA ( mRNA ); tus mRNA , nyob rau hauv lem, ua hauj lwm raws li ib tug template rau cov protein synthesis los ntawm kev txhais lus.

Ib sab saum toj no, koj yuav sau thiab txhais cov DNA li cas?

  1. Kauj ruam 1: DNA transcription. Siv cov strand ntawm DNA muab ib ntus thiab muab tso rau hauv tus tub txib RNA los ntawm kev hloov A nrog U, T nrog A, G nrog C thiab C nrog G. Qhov tshwm sim mRNA yuav tsum tau muab pub dawb rau DNA.
  2. Kauj Ruam 2: Kev txhais DNA. tRNA nyeem cov ntaub ntawv caj ces hauv mRNA hauv daim ntawv ntawm codon.

Ib yam li ntawd, koj tuaj yeem nug, koj puas paub yuav ua li cas siv lub hauv paus twg thaum koj tau sau cov DNA sib lawv liag rau mRNA codons?

Teb Chaws Kws Tshaj Lij Tshaj Tawm Adenine yeej ib txwm ua ke nrog thymine lossis uracil thiab guanine ib txwm ua nrog cytosine. Hauv kev sau ntawv , ib strand DNA yog luam tawm rau RNA nrog rau qhov sib xws puag khub tsuas yog RNA tsis muaj thymine xwb nws siv uracil.

DNA hloov mus rau mRNA li cas?

Nws siv DNA ua tus qauv los ua ib qho RNA molecule. RNA ces tawm ntawm lub nucleus thiab mus rau ib tug ribosome hauv cytoplasm, qhov chaw txhais lus tshwm sim. Nws yog kev hloov ntawm cov lus qhia caj ces hauv DNA rau tub txib RNA ( mRNA ). Thaum transcription, ib tug strand ntawm mRNA yog ua uas yog complementary rau ib tug strand ntawm DNA.

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