Cell surface membrane 0.0 / 5 ? BiologyCellular processes and structureASAQA Created by: meganbradfield1Created on: 23-03-16 17:53 What is the cell surface membrane? The plasma membrane that surrounds cells and forms a boundary between the cytoplasm and environment. 1 of 12 What does the cell surface membrane allow? Conditions to be established between the inside and outside of the cell. 2 of 12 What does the cell surface membrane control? The movement of substances in and out of the cell. 3 of 12 What do phospholipids form? The bilayer sheet. 4 of 12 What are the functions of phospholipids in the bilayer? Allow lipid-soluble substances to leave & enter the cell; prevent water-soluble substances entering/leaving; make the membrane flexible. 5 of 12 How are proteins arranged in the phospholipid bilayer? Extrinsic & Intrinsic 6 of 12 Where are extrinsic proteins found and what do they do? Found on the surface/embedded into the bilyaer; they give mechanical support or act as receptors for hormones. 7 of 12 Where are intrinsic proteins found and what do they do? Span the bilayer and act as carriers for water-soluble material/enzymes. 8 of 12 Name some functions of proteins in the bilayer. Structureal support; carriers; allow active transport; form ion channels; form recognition sites; act as receptors; help cells join together. 9 of 12 What is the cell surface membrane referred to? The fluid mosaic model. 10 of 12 What is meant by the 'fluid' part of the fluid mosaic model? Phospholipids move relative to one another, giving the membrane flexibility and changing shape. 11 of 12 What is meant by the 'mosaic' part of the fluid mosaic model? Proteins vary in shape, size and pattern. 12 of 12
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