Video: Lub cell membrane BBC Bitesize yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cell membrane . Nws cov qauv yog permeable rau qee yam khoom tab sis tsis yog rau lwm tus. Yog li ntawd, nws tswj kev txav ntawm cov khoom hauv thiab tawm ntawm cov khoom cell . Mitochondria. Organelles uas muaj cov enzymes rau kev ua pa, thiab qhov twg feem ntau lub zog tawm hauv kev ua pa.
Piv txwv li, cell membrane ua li cas?
Cov cell membrane tswj kev txav ntawm cov khoom hauv thiab tawm hlwb thiab organelles. Nyob rau hauv txoj kev no, nws yog xaiv permeable rau ions thiab organic molecules.
Tsis tas li ntawd, lub xovtooj yooj yim txhais li cas? Cov cell (los ntawm Latin cella, lub ntsiab lus "chav me") yog lub hauv paus structural, functional, thiab biological unit ntawm tag nrho cov paub kab mob. A cell yog qhov tsawg tshaj plaws ntawm lub neej. Cells feem ntau hu ua "lub tsev blocks ntawm lub neej". Kev kawm ntawm hlwb hu ua cell biology, cellular biology, los yog cytology.
Ib yam li ntawd, nws yog nug, dab tsi yog lub cell membrane ua ks3?
Cell membrane - qhov no puag ncig lub cell thiab tso cai rau cov as-ham nkag mus thiab pov tseg kom tawm mus. Nws muaj DNA, cov ntaub ntawv ntawm caj ces hlwb yuav tsum loj hlob thiab yug me nyuam. Cytoplasm - qhov no yog ib yam khoom zoo li jelly nyob rau hauv cov tshuaj tiv thaiv tshwm sim. Mitochondria - cov no yog lub zog ntawm lub cell.
Tus qauv ntawm lub cell membrane yog dab tsi?
Phospholipids tsim cov hauv paus qauv ntawm lub cell membrane , hu ua lipid bilayer. Kev tawg ntawm cov lipid bilayer yog cov roj cholesterol molecules, uas pab kom cov daim nyias nyias kua dej sib xws. Membrane cov proteins yog ib qho tseem ceeb rau kev thauj khoom thoob plaws hauv lub cev cell membrane.
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