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Chapter 5 - Chapter 5 Cell Membrane Structure and Function...

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Chapter 5 - Cell Membrane Structure and Function 5.1 How is the structure of a membrane related to its function? 5.2 How do substances move across membranes? 5.3 How do specialized junctions allow cells to connect and communicate?
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5.1 How Is the Structure of a Membrane Related to Its Function? 1. Selectively isolates cell’s contents from outside (phosph o lipids) 2. Regulates exchange of substances in and out (proteins) 3. Communicates with other cells (proteins) 4. Create attachments within & between cells (proteins) 5. Regulate many biochemical reactions (proteins)
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Fluid Mosaic Model
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head (hydrophilic) tails (hydrophobic) C CH CH 2 CH 2 CH 2 CH C O O N OP H 3 C CH 3 O O O H 2 C O HC CH 2 O CH 2 CH 2 CH 2 CH 2 CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 unsaturated
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phospholipid hydrophilic heads hydrophobic tails hydrophilic heads extracellular fluid (watery environment) cytoplasm (watery environment) bilayer
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(This picture is not in edition 7) Kinks increase membrane fluidity
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Membrane Proteins Form a Mosaic Proteins are embedded in the phospholipid bilayer Some proteins can float and drift Other proteins are anchored by protein filaments in the cytoplasm Many proteins have attached carbohydrates ( glycoproteins )
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5.1 How Is the Structure of a Membrane Related to Its Function? 5 major types of membrane proteins Receptor Proteins Recognition Proteins Enzymatic Proteins Attachment Proteins Transport Proteins (This section has changed slightly from ed. 7)
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Proteins in the Membrane Glycoprotein are a protein with a carbohydrate attached (diverse functions not mentioned in this book) Receptor Proteins : hormones or nutrients attach and trigger cellular responses
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(Picture not in ed. 7) Receptor Proteins
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