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active transport (process (molecule or ion to be transported binds to…
active transport
process
- molecule or ion to be transported binds to receptors in channel of carrier protein on outside of cell
- molecule or ion is released to inside of cell
- phosphate molecule is released from carrier protein and recombines with ADP to form ATP
- binding of phosphate molecule to carrier protein causes protein to change shape - opening up inside of cell
- on inside of cell ATP binds to carrier protein and is hydrolysed into ADP and phosphate
- carrier protein returns to original shape
energy requiring process
movement of molecules or ions into or out of a cell from a region of lower concentration to a region of higher concentration
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bulk transport
endocytosis
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- cell surface membrane invaginates when it comes into contact with material to be transported
- membrane enfolds the material until the membrane eventually fuses, forming a vesicle
- vesicle pinches off and moves into cytoplasm to transfer material for further processing within the cell
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exocytosis
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- vesicles usually formed by golgi apparatus move towards and fuse with cell surface membrane
- contents of vesicle released outside of cell