Video: Dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon ntawm E coli?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lactose operon ntawm Escherichia coli. Cov noob lacZ, lacY thiab lacA tau sau los ntawm ib tus neeg txhawb nqa (P) uas tsim ib qho mRNA los ntawm qhov uas peb cov proteins raug txhais. Lub operon yog tswj los ntawm Lac repressor, cov khoom ntawm lacI noob, uas yog transcribed los ntawm nws tus kheej txhawb (PI).
Tib neeg kuj nug, qhov ua haujlwm ntawm lac operon hauv E coli yog dab tsi?
Lub lac operon ntawm E. coli muaj cov noob koom nrog hauv lactose metabolism . Nws tsuas yog qhia thaum muaj lactose thiab qabzib tsis muaj. Ob tus neeg tswj hwm tig lub operon "rau" thiab "tawm" hauv kev teb rau cov qib lactose thiab qabzib: lac repressor thiab catabolite activator protein (CAP).
Tsis tas li ntawd, qhov kev ua haujlwm ntawm lacZ gene quizlet yog dab tsi? Qhov no noob encodes ib qho enzyme, galactoside permease, uas thauj lactose mus rau hauv lub cell. Qhov no noob encodes ib qho enzyme, b-galactosidase, uas cleaves lactose rau hauv ob lub qabzib molecules. Qhov no noob encodes ib qho enzyme, b-galactosidase, uas cleaves lactose rau hauv qabzib thiab galactose.
Yog li ntawd, dab tsi yog qhov ua haujlwm ntawm cov noob hauv lac operon?
Cov lac operon ua encodes cov noob tsim nyog kom tau thiab ua cov lactose los ntawm ib puag ncig hauv zos, uas suav nrog cov txheej txheem noob lacZ, lacY, thiab lacA. lacZ encodes β-galactosidase (LacZ), ib qho enzyme intracellular uas tshem tawm cov disaccharide. lactose rau hauv qabzib thiab galactose.
Lub luag haujlwm ntawm catabolite kev tawm tsam hauv lac operon yog dab tsi?
Catabolite kev tsim txom yog zoo tswj cov lac operon ua . Cov nyhuv yog qhov nce ntawm tus nqi ntawm transcription. Hauv qhov no, CAP protein yog qhib los ntawm cAMP los khi rau lub lac operon ua thiab pab txhawb txoj kev khi ntawm RNA polymerase rau tus txhawb nqa los sau cov noob rau lactose kev siv.
Pom zoo:
Dab tsi yog qhov tseem ceeb ntawm cov noob caj noob ces rau kev loj hlob ntawm fetal?
Kev soj ntsuam ntawm lub luag haujlwm ntawm chromosomes hauv tib neeg txoj kev loj hlob thiab kev loj hlob ntawm lub fetus tau mob siab rau qhov txawv txav ntawm chromosomal. Cov noob muaj cov lus qhia rau kev loj hlob thiab kev loj hlob. Qee qhov kev hloov gene ua rau cov gene faulty kom cov lus nyeem tsis raug lossis tsis nyeem tag nrho los ntawm lub xovtooj ntawm tes
Dab tsi yog txhais los ntawm cov noob tseem ceeb thiab cov noob caj noob ces?
(Nyob rau hauv cov ntsiab lus ntawm caj ces, ib qho tseem ceeb tshaj plaws yog ib qho uas yog phenotypically qhia hauv heterozygotes). Ib qho tseem ceeb tshaj plaws yog tawm tsam qhov tsis zoo uas tshwm sim tsuas yog thaum muaj ob daim ntawv theej ntawm cov noob. (Nyob rau hauv cov ntsiab lus genetic, ib tug recessive zoo yog ib tug uas yog phenotypically qhia tsuas yog nyob rau hauv homozygotes)
Dab tsi yog qhov kev kuaj hla hauv cov noob caj noob ces?
Nyob rau hauv cov noob caj noob ces, ib qho kev sim hla, thawj zaug qhia los ntawm Gregor Mendel, koom nrog kev yug me nyuam ntawm ib tus neeg nrog phenotypically recessive tus neeg, txhawm rau txiav txim siab zygosity ntawm yav dhau los los ntawm kev txheeb xyuas qhov feem ntawm cov xeeb ntxwv phenotypes. Zygosity tuaj yeem yog heterozygous lossis homozygous
Dab tsi yog lub luag haujlwm ntawm cov noob caj noob ces thiab chromosomes hauv kev xeeb tub?
Heredity plays lub luag haujlwm tseem ceeb hauv kev loj hlob ntawm cov yam ntxwv thiab kis tau los ntawm cov noob. Cov yam ntxwv uas peb tau txais los pab txhim kho peb tus cwj pwm, txiav txim siab los ntawm khub niam txiv, ib qho los ntawm txhua tus niam txiv. Cov noob muaj nyob hauv cov qauv zoo li hu ua chromosomes, uas yog tsim los ntawm DNA
Dab tsi yog Codominance hauv cov noob caj noob ces tsis yog Mendelian?
Thaum cov alleles rau ib qho kev coj cwj pwm yog codominant, lawv ob leeg qhia sib npaug es tsis yog ib qho tseem ceeb allele noj tag nrho cov kev tswj ntawm ib qho allele recessive. Qhov no txhais tau hais tias thaum lub cev muaj ob qhov sib txawv alleles (piv txwv li, yog heterozygote), nws yuav qhia ob qho tib si tib lub sijhawm