Video: Dab tsi yog cov tails ntawm phospholipids ntawm cov plasma membrane muaj li ntawm?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Phospholipids yog ib chav kawm ntawm lipids uas yog ib feem tseem ceeb ntawm tag nrho cov cell membranes. Lawv tuaj yeem tsim lipid bilayers vim lawv cov yam ntxwv amphiphilic. Cov qauv ntawm cov phospholipid molecule feem ntau muaj ob hydrophobic fatty acid "tails" thiab hydrophilic "lub taub hau" uas muaj phosphate pawg.
Tsuas yog li ntawd, lub plasma membrane yog dab tsi?
Cov plasma daim nyias nyias yog muaj li ntawm phospholipid bilayer, uas yog ob txheej ntawm phospholipids rov qab-rau-rov qab. Phospholipids yog lipids nrog ib pawg phosphate txuas rau lawv. Cov phospholipids muaj ib lub taub hau thiab ob lub tails. Lub taub hau yog polar thiab hydrophilic, los yog dej-hlub.
Tsis tas li ntawd, phospholipid yog dab tsi? Phospholipids muaj glycerol molecule, ob fatty acids, thiab ib pab pawg neeg phosphate uas hloov los ntawm ib tug cawv. Cov pab pawg phosphate yog qhov tsis zoo-them polar taub hau, uas yog hydrophilic. Cov kab mob fatty acid yog cov uas tsis muaj roj, tsis muaj polar tails, uas yog hydrophobic.
Tsis tas li ntawd paub, yuav piav qhia txog qhov permeability ntawm phospholipid bilayer ntawm plasma membranes li cas?
Ib tug xaiv permeable daim nyias nyias , uas encloses lub cell. - Cov plasma membrane tau piav qhia raws li cov kua dej mosaic qauv vim nws ua los ntawm ib tug phospholipid bilayer , cia nws yooj yim khoov thiab txav mus raws yam tsis muaj kev tawg lossis ripping lub daim nyias nyias vim yog cov hydrophobic thiab hydrophilic ncej ntawm lub bilayer.
Yuav ua li cas cov phospholipids npaj los tsim cov plasma membrane?
Phospholipids yog npaj nyob rau hauv ib tug bilayer (ib ob txheej). Lawv muaj hydrophobic tailss (ua los ntawm fatty acids) thiab lub taub hau hydrophilic (ua los ntawm ib pab pawg phosphate). Lub taub hau hydrophilic yog rau sab nraud thiab cov tails mus rau sab hauv.
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