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Membranes (Functions (Separates cell contents from external environment,…
Membranes
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Fluid-mosaic model
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Proposed the membrane consisted of a phospholipid bilayer with the proteins floating in it in a mosaic pattern
Lipid molecules can change places with each other and some proteins may move, giving the membrane fluidity
Hydrophilic heads are in contact with the watery exterior or interior, while the hydrophobic tail regions are in the centre of the membrane
Eukaryotic cell membranes may contain cholesterol which is important for helping to regulate the fluidity, maintain mechanical stability and resist the effects of temperature changes
Keywords
Fluid-mosaic model: Theory of cell membrane structure with proteins embedded in a sea of phospholipids
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Partially permeable
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Small molecules diffuse through the membrane via simple diffusion, in between the membrane's structured molecules
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Within cells
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Inner membranes in chloroplasts (thkyloid membranes) house chlorophyll and is the site of some photosynthesis reactions
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