Tsuas yog cov ntaub ntawv me me thiab tsis muaj polar tuaj yeem yooj yim diffuse los ntawm lipid bilayer. Cov khoom loj tsis tuaj yeem haum rau ntawm tus kheej phospholipids uas tau ntim ua ke, thiab cov polar molecules raug tshem tawm los ntawm hydrophobic / nonpolar lipids uas kab rau sab hauv ntawm lub bilayer.
Puas dej tuaj yeem nkag mus thoob plaws lipid bilayer?
Protein-free Lipid Bilayers Muaj Kev Ua Phem Rau Ions
me me uas tsis muaj polar molecules, xws li O 2 thiab CO 2, nkag tau yooj yim yaj hauv lipid bilayers thiab yog li nthuav dav thoob plaws lawv. Cov me me uas tsis muaj lub ncov qaumteb qabteb molecules, xws li dej los yog urea, kuj diffuse hla ib lub bilayer, txawm tias qeeb dua (Daim duab 11-1).
Puas lipids tuaj yeem sib kis thoob cov membrane?
Cell membranes ua haujlwm thaiv thiab thaiv qhov rooj. Lawv yog cov semi-permeable, uas txhais tau hais tias qee cov molecules tuaj yeem nthuav dav thoob plaws lipid bilayer tab sis lwm tus tsis tuaj yeem. Me me hydrophobic molecules thiab gases zoo li oxygen thiab carbon dioxide hla daim nyias nyias sai.
Cov tshuaj dab tsi uas tsis tuaj yeem cuam tshuam los ntawm lipid bilayer quizlet?
Cov tshuaj dab tsi tsis tuaj yeem yooj yim dhau los ntawm lipid bilayer? dej soluble tshuaj (ntsev, qab zib, thiab lwm yam) …
- Pinocytosis ("kev haus ntawm tes") txav cov kua (tej dej) mus rau hauv lub cell.
- Receptor-mediated endocytosis txav cov molecules tshwj xeeb rau hauv cell.
- Phagocytosis ("cell noj") txav cov khoom loj rau hauv lub cell.
Yuav ua li cas hauv qab no tuaj yeem nkag mus thoob plaws lub cell membrane?
Dej diffusion hu ua osmosis. Oxygen yog ib lub molecule me me thiab nws tsis yog polar, yog li nws yooj yim dhau los ntawm cell membrane. Cov pa roj carbon dioxide, cov khoom ua pa ntawm tes ua pa, yog qhov me me txaus kom nkag tau tawm ntawm lub cell. Me me lipid molecules tuaj yeem dhau los ntawm lipid innards ntawm daim nyias nyias.
