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Published byBrett Spencer Modified over 9 years ago
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Part 1: Overview of Cells, Cell Membrane
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Basic unit of structure & function 200 different cell types Made of C, O, H, N + trace elements 3 main parts: 1. Plasma membrane 2. Cytoplasm 3. Nucleus
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Function: enclose cell contents, control exchange of substances with environment, cell communication Made of: Lipid bilayer Cholesterol Glycolipids Proteins
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Proteins float in fluid lipid bilayer
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1. Phospholipid 1. Phospholipid: hydrophilic Polar/hydrophilic (water-loving) “head” hydrophobic Nonpolar/hydrophobic (water-fearing) “tail”
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2. Cholesterol 20% of membrane lipid Stabilize membrane Maintain fluidity
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3. Glycolipids Lipid + sugar attached 5% membrane lipid For cell recognition glycolipid
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1. Integral Proteins Inserted into lipid bilayer Have both hydrophilic & hydrophobic regions Functions Functions: enzymes, transport, receptors (relay messages) integral proteins
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2. Peripheral Proteins Attached loosely to membrane Functions Functions: support, enzymes, movement, linkage peripheral protein
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protein + sugar attached Serves as specific biological marker cell recognition glycoprotein
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Transport
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Receive chemical messages
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Maintain cell shape
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Enzyme activity
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Intercellular joining
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Cell-cell recognition “ID tags”
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