Kev txhais yuav siv qhov chaw hauv lub nucleus. Nws siv DNA ua tus qauv los ua ib qho RNA (mRNA) molecule. Thaum lub sij hawm transcription, ib tug strand ntawm mRNA yog ua uas yog complementary rau ib tug strand ntawm DNA. Daim duab 1 qhia tias qhov no tshwm sim li cas.
daim ntawv sau cia nyob qhov twg?
Nyob hauv eukaryotes, kev txhais lus thiab kev txhais lus muaj nyob rau hauv cov cellular compartments: transcription yuav siv sij hawm chaw nyob rau hauv lub membrane-bounded nucleus, whereas translation tshwm sim sab nraum lub nucleus nyob rau hauv lub cytoplasm. Hauv prokaryotes, ob txheej txheem yog sib txuas ua ke (Daim duab 28.15).
DNA yog dab tsi?
Hauv kev sau ntawv, thaj tsam ntawm DNA qhib. Ib txoj hlua, qauv strand, ua tus qauv rau kev sib txuas ntawm RNA cov ntawv sau ntxiv. Lwm strand, coding strand, yog zoo tib yam rau RNA transcript nyob rau hauv sequence, tsuas yog hais tias nws muaj uracil (U) bases nyob rau hauv qhov chaw ntawm thymine (T) bases.
gene nyob qhov twg?
Genes tau pom ntawm cov qauv me me zoo li lub npe hu ua chromosomes (hais: KRO-moh-somes). Thiab chromosomes muaj nyob hauv cov hlwb. Koj lub cev yog tsim los ntawm billions ntawm cov hlwb. Cells yog cov chav me me uas tsim txhua yam muaj sia.
Dab tsi yog noob sau?
Kev txhais lus yog tus txheej txheem ntawm kev ua RNA luam ntawm cov noob kab ke. Daim ntawv theej no, hu ua messenger RNA (mRNA) molecule, tawm ntawm lub cell nucleus thiab nkag mus rau cytoplasm, qhov uas nws coj cov synthesis ntawm cov protein, uas nws encodes.
