Video: Dab tsi attracts dej nyob rau hauv lub cell membrane?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov plasma daim nyias nyias yog tsim los ntawm ob txheej ntawm molecules hu ua phospholipids. Txhua phospholipid molecule muaj phosphate "lub taub hau" thiab ob fatty acid chains uas dangle ntawm lub taub hau. Lub cheeb tsam phosphate yog hydrophilic (lus, " dej -hlub") thiab attracts dej.
Ib yam li ntawd, tib neeg nug, qhov twg ntawm cov cell membrane nyiam cov dej molecules?
Cov cell membrane kuj hu ua PLASMA daim nyias nyias thiab yog ua los ntawm phospholipid BI-LAYER. Cov phospholipids muaj hydrophilic ( dej attracting ) HUAB TAIS thiab ob lub hydrophobic ( dej repelling) TAIS. Lub taub hau ntawm phospholipid yog ua los ntawm cov cawv thiab GLYCEROL pawg, thaum cov tails yog chains ntawm FATTY ACIDS.
Dab tsi pab tswj kev hloov pauv ntawm cov cell membrane? Cov roj cholesterol molecules tseem ua rau cov phospholipid tails los ntawm kev sib cuag thiab ua kom khov. Qhov no xyuas kom meej tias cov cell membrane nyob twj ywm kua thiab hloov tau . Ib txhia plasma daim nyias nyias Cov proteins nyob rau hauv cov lipid bilayer thiab hu ua ib qho proteins.
Yog li ntawd, dab tsi ua rau lub cell membrane kua?
Cell membrane yog kua dej vim hais tias ib tug neeg phospholipid molecules thiab cov proteins tau diffuse nyob rau hauv lawv cov monolayer thiab yog li txav mus los. Lub fluidity yog cuam tshuam los ntawm: qhov ntev ntawm fatty acid saw. Ntawm no, qhov luv ntawm cov saw hlau ntau dua kua dej yog cov daim nyias nyias.
Dab tsi ntawm cov cell membrane koom nrog hauv cell kom paub txog cov cell?
Nyob rau hauv cov ntaub ntawv ntawm plasma daim nyias nyias , cov compartments yog sab hauv thiab sab nraud cell . Proteins embedded nyob rau hauv lub phospholipid bilayer nqa tawm lub zog tshwj xeeb ntawm lub plasma daim nyias nyias , suav nrog kev xaiv thauj khoom ntawm molecules thiab cell - cell paub.
Pom zoo:
Yuav ua li cas cov txheej txheem ntawm cell faib nyob rau hauv eukaryotes feem ntau zoo ib yam li cell faib nyob rau hauv prokaryotes?
Tsis zoo li eukaryotes, prokaryotes (uas suav nrog cov kab mob) tau txais ib hom kev faib cell hu ua binary fission. Hauv qee qhov, cov txheej txheem no zoo ib yam li mitosis; Nws yuav tsum tau rov ua dua ntawm cov cell chromosomes, cais ntawm cov theej DNA, thiab kev sib cais ntawm niam txiv cell cytoplasm
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