Part 1: Overview of Cells, Cell Membrane

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Presentation transcript:

Part 1: Overview of Cells, Cell Membrane

Basic unit of structure & function 200 different cell types Made of C, O, H, N + trace elements 3 main parts: Plasma membrane Cytoplasm Nucleus

Function: enclose cell contents, control exchange of substances with environment, cell communication Made of: Lipid bilayer Cholesterol Glycolipids Proteins

Proteins float in fluid lipid bilayer

Phospholipid: Polar/hydrophilic (water-loving) “head” Nonpolar/hydrophobic (water-fearing) “tail”

Cholesterol 20% of membrane lipid Stabilize membrane Maintain fluidity

Glycolipids glycolipid Lipid + sugar attached 5% membrane lipid For cell recognition glycolipid

integral proteins Integral Proteins Inserted into lipid bilayer Have both hydrophilic & hydrophobic regions Functions: enzymes, transport, receptors (relay messages) integral proteins

peripheral protein Peripheral Proteins Attached loosely to membrane Functions: support, enzymes, movement, linkage peripheral protein

glycoprotein protein + sugar attached Serves as specific biological marker  cell recognition glycoprotein

Transport

Receive chemical messages

Maintain cell shape

Enzyme activity

Intercellular joining

Cell-cell recognition “ID tags”