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1. Part 1: Overview of Cells, Cell
Membrane

2.  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

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

7.  Proteins float in fluid lipid bilayer

8. 11.. PPhhoosspphhoolliippiidd:
Polar/hhyyddrroopphhiilliicc (water-loving) “head”
Nonpolar/hhyyddrroopphhoobbiicc (water-fearing) “tail”

10. 22.. CChhoolleesstteerrooll
20% of membrane lipid
Stabilize membrane
Maintain fluidity

11. 33.. GGllyyccoolliippiiddss
Lipid + sugar attached
5% membrane lipid
For cell recognition
glycolipid

12. 11.. IInntteeggrraall PPrrootteeiinnss
 Inserted into lipid bilayer
 Have both hydrophilic & hydrophobic
regions
 FFuunnccttiioonnss: enzymes, transport, receptors
(relay messages)
integral
proteins

13. 22.. PPeerriipphheerraall PPrrootteeiinnss
 Attached loosely to membrane
 FFuunnccttiioonnss: support, enzymes, movement,
linkage
peripheral
protein

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

15. Transport

16. Receive chemical
messages

17. Maintain cell shape

18. Enzyme activity

19. Intercellular joining

20. Cell-cell recognition
“ID tags”