Video: Lub cell membrane yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov Cell Membrane . Txhua tus nyob hlwb thiab ntau yam me me organelles nyob rau hauv hlwb yog bounded los ntawm nyias daim nyias nyias . Cov no daim nyias nyias yog tsim Feem ntau ntawm phospholipids thiab cov proteins thiab feem ntau piav raws li phospholipid bi-layers.
Hauv qhov no, dab tsi ua rau lub cell membrane?
Phospholipids ua lub hauv paus qauv ntawm a cell membrane . Qhov kev npaj ntawm phospholipid molecules ua cov lipid bilayer. Phospholipids ntawm a cell membrane yog teem rau hauv ob txheej hu ua lipid bilayer. Lub taub hau hydrophilic phosphate yeej ib txwm npaj kom lawv nyob ze dej.
Kuj Paub, dab tsi ua rau 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.
Ua li no, cell membrane yog dab tsi thiab nws ua li cas?
Cov cell membrane , kuj hu ua lub plasma membrane , yog ob txheej ntawm lipids thiab cov proteins uas nyob ib puag ncig a cell thiab cais cov cytoplasm (cov ntsiab lus ntawm cov cell ) los ntawm nws ib puag ncig. Nws yog selectively permeable, uas txhais tau hais tias nws tsuas cia tej molecules nkag thiab tawm.
Dab tsi yog peb lub molecules ntawm cell membrane yog tsim los ntawm?
Cov khoom tseem ceeb ntawm cov plasma membrane yog lipids ( phospholipids thiab cov roj cholesterol ), cov proteins , thiab carbohydrate pab pawg uas txuas nrog rau qee qhov lipids thiab cov proteins . Ib tug phospholipid yog ib tug lipid ua los ntawm glycerol, ob fatty acid tails, thiab ib tug phosphate-txuas taub hau pab pawg neeg.
Pom zoo:
Ob qhov tseem ceeb ntawm lub voj voog ntawm tes yog dab tsi thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Muaj ob theem tseem ceeb hauv lub voj voog ntawm tes. Thawj theem yog interphase thaum lub cell loj hlob thiab replicates nws DNA. Qhov thib ob yog theem mitotic (M-Phase) thaum lub sijhawm cell faib thiab hloov ib daim qauv ntawm nws cov DNA mus rau ob lub hlwb zoo tib yam
Lub cell membrane pab lub cell phab ntsa li cas?
Cell phab ntsa tsis muaj receptors. Lub membrane yog permeable thiab tswj kev txav ntawm cov khoom mus rau hauv thiab sab nraud ntawm tes. Ntawd yog, nws tuaj yeem tso cai rau dej thiab lwm yam khoom hla dhau los ntawm kev xaiv. Cov haujlwm muaj xws li kev tiv thaiv los ntawm ib puag ncig sab nraud
Lub luag haujlwm ntawm lub cell membrane yog dab tsi thaum lub sijhawm thauj mus los?
Lub cell membrane yog xaiv permeable rau ions thiab organic molecules thiab tswj kev txav ntawm cov khoom hauv thiab tawm ntawm lub hlwb. Lub luag haujlwm tseem ceeb ntawm cov cell membrane yog los tiv thaiv lub cell ntawm nws ib puag ncig. Nws muaj phospholipid bilayer nrog embedded proteins
Dab tsi yog 2 qhov tseem ceeb ntawm lub voj voog ntawm tes thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Cov xwm txheej no tuaj yeem muab faib ua ob qhov tseem ceeb: interphase (hauv nruab nrab ntawm kev sib faib theem ua pawg G1 theem, S theem, G2 theem), thaum lub xov tooj ntawm tes tsim thiab ua nrog nws cov haujlwm metabolic; mitotic theem (M mitosis), thaum lub sij hawm lub cell yog replicating nws tus kheej
Dab tsi yog cell membrane hauv prokaryotic cell?
Prokaryotes thiab eukaryotes yog ob hom cell uas muaj nyob. Tab sis, prokaryotes muaj qee cov organelles nrog rau cov cell membrane, kuj hu ua phospholipid bilayer. Cov cell membrane no kaw lub cell thiab tiv thaiv nws, tso cai rau hauv qee cov molecules raws li qhov xav tau ntawm tes