Video: Puas yog cov plasma membrane zoo ib yam li phospholipid bilayer?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lwm yam daim nyias nyias ib puag ncig organelles kuj yog cov lipid bilayers , thiab lawv feem ntau fuse thiab pinch tawm ntawm lub plasma daim nyias nyias . Tab sis lawv tsis yog plasma daim nyias nyias . Yog li thaum lub plasma daim nyias nyias yog ib txwm (hauv ib feem ua los ntawm) lipid daim tawv nqaij , lipid daim tawv nqaij tsis yog ib txwm (ib feem ntawm) lub plasma daim nyias nyias.
Hauv qhov no, puas yog phospholipid bilayer lub plasma membrane?
Cov phospholipids hauv plasma daim nyias nyias tau teem rau ob txheej, hu ua a phospholipid bilayer . Molecules uas yog hydrophobic tuaj yeem yooj yim dhau los ntawm plasma daim nyias nyias , yog hais tias lawv me me, vim hais tias lawv yog cov dej-ntxhais zoo li sab hauv ntawm lub daim nyias nyias.
Qhov thib ob, 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 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.
Ib tug kuj yuav nug, dab tsi yog qhov txawv ntawm lipid bilayer thiab plasma membrane?
Cov lipid daim tawv nqaij ntawm ntau cell daim nyias nyias tsis yog tsim tshwj xeeb ntawm phospholipids, txawm li cas los xij; Nws feem ntau kuj muaj cov roj cholesterol thiab glycolipids. Eucaryotic plasma daim nyias nyias muaj cov roj cholesterol tshwj xeeb (Daim duab 10-10) - txog li ib lub molecule rau txhua phospholipid molecule.
Vim li cas phospholipids tsim bilayer hauv plasma membranes?
Thaum twg phospholipids yog tov nrog dej, lawv spontaneously rearrange lawv tus kheej mus daim ntawv qhov qis tshaj dawb-zog configuration. Qhov no txhais tau hais tias cov cheeb tsam hydrophobic nrhiav txoj hauv kev los tshem tawm lawv tus kheej ntawm dej, thaum thaj chaw hydrophilic cuam tshuam nrog dej. Cov qauv tsim tau hu ua lipid bilayer.
Pom zoo:
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