2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Kev loj hlob hloov pauv lub cev feem ntawm tib neeg thiab tsiaj txhu kompiv ntawm lub taub hau siab rau lub cev qhov siab txo qis nrog hnub nyoog. Cov kev tshawb fawb ua ntej tau pom tias lub cev qhov sib npaug muab cov ntaub ntawv zoo rau kev nkag siab txog hnub nyoog.
Cov menyuam mos loj hlob li cas?
Lawv nrhiav kev ruaj khov thiab sib npaug ntawm qhov siab, qhov hnyav thiab lub taub hau ncig, qhov taw qhia ntawm lub hlwb kev loj hlob. Tsuav tus me nyuam tseem nce qhov hnyav thiab qhov siab sib npaug ntau xyoo- txawm tias nws tseem nyob qis dua li qhov nruab nrab - nws yog qhov qhia txog kev loj hlob tsis tu ncua.
Qhov feem ntawm lub taub hau piv rau lub cev hloov li cas thaum peb muaj hnub nyoog?
Thaum yug, lub taub hau ua txog 25 feem pua ntawm peb qhov ntev (xav seb koj qhov ntev npaum li cas yuav yog lub taub hau yog tias qhov proportions tseem zoo li qub!). Thaum muaj hnub nyoog 25 xyoos nws muaj li ntawm 20 feem pua ntawm peb qhov ntev. … Thaum muaj hnub nyoog 2 xyoos, nws yog ntawm 75 feem pua nws cov neeg laus qhov hnyav, ntawm 95 feem pua ntawm hnub nyoog 6 thiab ntawm 100 feem pua ntawm hnub nyoog 7 xyoo.
Yuav ua li cas lub cev proportions piv rau tag nrho qhov siab hloov ntawm yug mus rau neeg laus?
Qhov siab zaum nruab nrab yog kwv yees li 70% ntawm tag nrho qhov siab thaum yug los, tab sis poob nrawm mus txog 57% hauv xyoo thib 3. Thaum muaj hnub nyoog 13 xyoos hauv cov ntxhais, thiab ob xyoos tom qab hauv cov tub hluas, qhov sib piv ntawm zaum qhov siab rau tag nrho lub cev qhov siab yog txog 50%. Kev hloov ntawm zaum qhov siab txij thaum yug mus rau neeg laus.
Lub cev lub cev hloov pauv li cas ntawm cov menyuam mos mus txog rau thaum yau?
Lub cev, thaum yug thiab hnub nyoog peb xyoos ib tus menyuam feem ntau ua ob npaug hauv qhov siab thiab plaub npaug ntawm qhov hnyav. Lub cev feem ntawm lub cev kuj hloov mus, yog li ntawd tus me nyuam mos, uas nws lub taub hau suav txog yuav luag ib feem plaub ntawm tag nrho lub cev ntev, dhau los ua tus menyuam me uas muaj qhov sib npaug, zoo li tus neeg laus zoo li.
Pom zoo:
Dab tsi yog qhov hloov pauv thiab hloov pauv hloov pauv?
Point mutations hloov ib leeg nucleotide. Frameshift kev hloov pauv yog ntxiv lossis tshem tawm ntawm nucleotides uas ua rau muaj kev hloov pauv hauv kev nyeem ntawv. frameshift thiab point mutation yog dab tsi? Ib qho kev hloov pauv cuam tshuam rau ib khub hauv paus.
Qhov kev hloov pauv no puas yuav ua rau muaj kev hloov pauv hloov pauv?
Yog li, yog tias muaj kev hloov pauv, piv txwv li, kev ntxig lossis tshem tawm ntawm nucleotide, tshwm sim, qhov no tuaj yeem ua rau kev hloov pauv ntawm kev nyeem ntawv. Nws hloov tag nrho cov amino acid ib ntus. Cov kev hloov pauv no yog hu ua frameshift mutation (tseem hu ua kev nyeem ntawv hloov pauv, nyeem ntawv hloov pauv, lossis framing yuam kev).
Qhov twg yog qhov kev hloov pauv hloov pauv hloov pauv?
Semiconservative replication piav qhia txog cov txheej txheem ntawm DNA replication nyob rau hauv tag nrho cov paub hlwb. DNA replication tshwm sim ntawm ntau lub hauv paus pib ntawm kev rov ua dua raws DNA qauv strand. Raws li DNA ob chav helix yog unwound by helicase, replication tshwm sim nyias ntawm txhua tus qauv strand nyob rau hauv antiparallel cov lus qhia.
Qhov kev hloov pauv twg yog xav tias yuav cuam tshuam los ntawm kev hloov pauv hloov pauv?
Dependent Variable Qhov sib txawv uas nyob ntawm lwm yam uas ntsuas. Cov kev hloov pauv no yuav tsum tau hloov pauv raws li qhov kev sim ua haujlwm ntawm tus kheej hloov pauv lossis hloov pauv. Nws yog cov nyhuv presumed. Qhov kev tshawb fawb hloov pauv twg yog qhov tshwm sim?
Los ntawm kev hloov pauv hloov pauv hloov pauv?
Kev hloov pauv hloov pauv hloov pauv (TMA) yog qhov isothermal (tsis hloov pauv nucleic acid kub), ib leeg-tube nucleic acid amplification system siv ob lub enzymes, RNA polymerase thiab thim rov qab kev sau ntawv. … Cov txheej txheem no tuaj yeem siv los tsom rau RNA thiab DNA.
