1. Part 1: Overview of Cells, Cell Membrane
Chapter 3: Cells
Part 1: Overview of Cells, Cell Membrane

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

3. Cell diversity

4. cell structure

5. Plasma membrane

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

7. Fluid mosaic model
Proteins float in fluid lipid bilayer

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

9. Lipid bilayer

10. Membrane lipids Cholesterol 20% of membrane lipid Stabilize membrane
Maintain fluidity

11. Membrane lipids Glycolipids glycolipid Lipid + sugar attached
For cell recognition
glycolipid

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

13. Membrane proteins peripheral protein Peripheral Proteins
Attached loosely to membrane
Functions: support, enzymes, movement, linkage
peripheral protein

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

15. Membrane protein functions
Transport

16. Membrane protein functions
Receive chemical messages

17. Membrane protein functions
Maintain cell shape

18. Membrane protein functions
Enzyme activity

19. Membrane protein functions
Intercellular joining

20. Membrane protein functions
Cell-cell recognition “ID tags”