Plasma membrane

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    diffusion definition

    the net movement of particles from a region of higher concentration to an area of lower concentration

    osmosis definition

    the movement of water molecules from an area of high water potential to an area of lower water potential through a membrane

    osmosis definition

    the movement of water molecules from an area of high water potential to an area of low water potential through a partially permeable membrane

    What molecules pass through the membrane through simple diffusion

    Small non polar molecules like gases e.g oxygen

    What is the function of a glycoproteins

    Cell signalling- the carbohydrates act as receptors that bind to hormones to respond Cell recognition-

    What do the properties of the fluid mosaic model indicate

    The proteins and lipids within the membrane can move laterally and are flexible The pattern of proteins is scattered and appears irregular

    What is endocytosis

    Bulk transport of large molecules into a cell as a form of active transport. Requires energy

    What is exocytosis

    Bulk transport of large molecules out of a cell as a form of active transport. Requires energy

    What kinds of proteins exist on the surface of the membrane

    Extrinsic proteins

    What is facilitated diffusion

    diffusion across a membrane by using protein structures

    Which types of transport in membranes require energy

    Protein pump- active transport with protein Bulk transport- endocytosis and exocytosis

    What is the enzyme that breaks apart milk

    lactase

    What is the role of membranes within cells

    compartmentalisation Prevent disruption of reactions Isolates nucleus Nuclear pore let's dna leave Forms Golgi