Thaum lub sijhawm txhais lus, ribosomal subunits sib sau ua ke zoo li lub qhaub cij ntawm mRNA strand, qhov chaw uas lawv txuas ntxiv mus nyiam tRNA molecules tethered rau amino acids (circles) Cov saw ntev ntawm cov amino acids tshwm sim raws li lub ribosome txiav txim lub mRNA ib theem zuj zus mus rau hauv ib tug polypeptide, los yog ib tug tshiab protein.
Dab tsi yog ribosome khi rau hauv kev txhais lus?
Thaum pib, lub me me ribosomal subunit khi rau pib ntawm mRNA sequence Ces hloov RNA (tRNA) molecule nqa cov amino acid methionine khi rau qhov hu ua pib. codon ntawm mRNA sequence. Pib codon nyob rau hauv tag nrho cov mRNA molecules muaj cov kab ke AUG thiab cov lej rau methionine.
Yuav ua li cas khi rau dab tsi hauv kev txhais lus?
Cov kauj ruam hauv kev txhais lus yog:
The ribosome khi rau mRNA ntawm thaj chaw tshwj xeeb. Lub ribosome pib txuam tRNA anticodon sequences rau mRNA codon sequence. Txhua zaus ib lub tRNA tshiab los rau hauv lub ribosome, cov amino acid uas nws tau nqa tau ntxiv rau cov elongating polypeptide saw.
Qhov twg ribosomes khi rau mRNA thaum lub sijhawm txhais lus?
Thaum pib ntawm kev txhais lus, ribosome thiab tRNA txuas rau mRNA. Lub tRNA nyob hauv ribosome thawj qhov chaw docking. Qhov no tRNA anticodon yog ntxiv rau mRNA qhov pib codon, qhov twg pib txhais lus.
ribosomes khi nyob rau hauv lub cell nyob qhov twg?
Ribosomes pom 'dawb' hauv cytoplasm lossis khi mus rau endoplasmic reticulum (ER) los tsim ER. Nyob rau hauv ib tug mammalian cell yuav muaj li 10 lab ribosomes. Ob peb ribosomes tuaj yeem txuas rau tib lub mRNA strand, cov qauv no hu ua polysome.
