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Lecture 22.docx

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York University
Natural Science
NATS 1670
Motti Anafi

Chapter 3 Cell Structure and Function Figure 3.16 The structure of a prokaryotic cytoplasmic membrane: a phospholipid bilayer Transmembrane Proteins • Proteins embedded within the phospholipid bilayer carry out the specific functions of the plasma membrane o Control the passage of most biological molecules across the plasma membrane  Transport proteins o Cell-cell recognition: t-cells have to touch virus cells (hydrophobic cells like to interact with hydrophobic cells)  Mediate interactions between cells • Different cell types have different set of membrane proteins: This is one of the ways we can identify our cells. The membranes are similar in most of the cases. o Signal transduction  Serve as sensors through which the cell receives signals from its environment • receptors Glycoproteins Human biology by Daniel Chiras • Most Transmembrane proteins of the plasma membrane are glycoproteins with their oligosaccharides exposed on the surface of the cell. • The role of the glycocalyx is o To protect the cell surface o To serve as markers for a variety of cell-cell interactions Vesicle • A pocket m
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