Video: Dab tsi yog qhov tshwj xeeb ntawm kev hloov pauv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Dab tsi yog qhov tshwj xeeb ntawm kev hloov pauv piv rau cov kab mob bacteriophage li qub? Cov kab mob bacteriophage tsis tshwm sim los ntawm cov kab mob hauv lub cev kev hloov pauv . Kev hloov pauv hloov DNA los ntawm chromosome ntawm ib lub cell mus rau lwm tus. Cov kab mob bacteriophage siv cov khoom tawg ntawm cov cell nrog nws thaum lub sijhawm kev hloov pauv.
Kuj kom paub yog, qhov txawv ntawm qhov kev hloov pauv dav dav thiab tshwj xeeb yog dab tsi?
Muaj ob hom kev hloov pauv : generalized thiab tshwj xeeb . Hauv generalized transduction , cov kab mob bacteriophages tuaj yeem khaws ib feem ntawm tus tswv tsev genome. Nyob rau hauv sib piv, nrog tshwj xeeb transduction , cov kab mob bacteriophages khaws tsuas yog qee feem ntawm tus tswv tsev DNA.
Ib sab saum toj no, qhov twg zoo tshaj plaws piav qhia txog kev hloov pauv hauv cov kab mob? Kab mob Hloov DNA nrog bacteriophages hu ua kev hloov pauv . Tus kab mob bacteriophage yog tus kab mob uas rov ua dua hauv lub cev kab mob cell. Yog li, Option A yog lawm. Kab mob Txhaj DNA rau hauv lwm lub hlwb nrog kev pab ntawm lub raj, txheej txheem no hu ua Conjugation.
Tom qab ntawd, lo lus nug yog, dab tsi yog lub luag haujlwm ntawm kev sib txuas Pilus?
Cov cell nrog lub conjugation pilus, txuas mus rau lwm tus cell , txuas lub cytoplasm ntawm txhua tus cell thiab tso cai rau cov molecules ntawm DNA hla dhau lub hollow pilus. Feem ntau cov DNA pauv, muaj cov noob yuav tsum tau ua thiab hloov pili, uas yog encoded ntawm plasmid.
Dab tsi yog suav tias yog qhov nruab nrab natural mutation?
Yog xav li cas ua tus nruab nrab natural mutation tus nqi uas tshwm sim thaum DNA replication? Ib qho ntawm txhua trillion nucleotides replicated. Ib ntawm txhua lab nucleotides replicated. Ib ntawm txhua billion nucleotides replicated.
Pom zoo:
Dab tsi yog qhov kev hloov pauv hloov pauv?
Kev hloov pauv, hauv molecular biology, yog hais txog kev hloov pauv hauv deoxyribonucleic acid (DNA), qhov twg ib qho (ob lub nplhaib) purine hloov pauv rau (ib lub nplhaib) pyrimidine, los yog vice versa
Dab tsi yog qhov txawv ntawm ib puag ncig kev hloov pauv thiab kev hloov pauv qub txeeg qub teg?
Qhov sib txawv ntawm cov yam ntxwv ntawm cov tib neeg ntawm tib hom yog hu ua variation. Qhov no yog inherited variation. Qee qhov kev hloov pauv yog qhov tshwm sim ntawm qhov sib txawv ntawm ib puag ncig, lossis ib tus neeg ua dab tsi. Qhov no yog hu ua environmental variation
Dab tsi yog qhov kev hloov pauv ntawm cov khoom uas txav ntawm qhov chaw mus rau qhov chaw ntawm - 12 m?
Kev piav qhia: Qhov kev txav ntawm ib qho khoom txav ntawm qhov chaw mus rau qhov chaw ntawm − 12 m yog 12 meters. Qhov kev ncua deb ntawm lub hauv paus chiv keeb mus rau qhov siab tshaj plaws txoj hauj lwm yog hu ua displacement ntawm ib yam khoom. Qhov siab tshaj plaws kev hloov pauv ntawm cov khoom nyob rau hauv ib nthwv dej yog hu ua crest thiab qhov tsawg kawg nkaus hloov pauv yog hu ua trough
Puas yog kev sib hloov kho qhov muag thiab kev sib hloov tshwj xeeb zoo ib yam?
Hauv chemistry, kev sib hloov tshwj xeeb ([α]) yog cov cuab yeej ntawm cov tshuaj chiral. Yog hais tias lub compound muaj peev xwm tig lub dav hlau ntawm polarization ntawm lub dav hlau-polarized lub teeb, nws tau hais tias yog "optically active". Kev sib hloov tshwj xeeb yog cov cuab yeej siv zog, qhov txawv ntawm qhov tshwm sim ntau dua ntawm kev hloov kho qhov muag
Peb qhov laj thawj tseem ceeb ntawm kev hloov pauv hloov pauv yog dab tsi?
Allele frequencies nyob rau hauv ib tug pej xeem yuav hloov vim plaub lub hauv paus zog ntawm evolution: Natural Selection, Genetic Drift, Mutations thiab Gene Flow. Kev hloov pauv yog qhov kawg ntawm cov alleles tshiab hauv cov noob caj noob ces. Ob ntawm cov txheej txheem tseem ceeb tshaj plaws ntawm kev hloov pauv hloov pauv yog: Natural Selection thiab Genetic Drift