1. Part 1: Overview of Cells, Cell Membrane http://wps.aw.com/bc_marieb_ehap_9/79/20307/5198801.cw/index.html

2. Cells 1) Name the four elements that make up the bulk of living matter and list several trace elements. 2) Define cell, organelle, and inclusion. 3) Identify on a cell model or diagram the three major cell regions (nucleus, cytoplasm, and plasma membrane). 4) List the structures of the nucleus and explain the function of chromatin and nucleoli. 5) Identify the organelles on a cell model or describe them, and discuss the major function of each.

3.  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

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

8.  Proteins float in fluid lipid bilayer

9. 1. Phospholipid 1. Phospholipid: hydrophilic  Polar/hydrophilic (water-loving) “head” hydrophobic  Nonpolar/hydrophobic (water-fearing) “tail”

11. 2. Cholesterol  20% of membrane lipid  Stabilize membrane  Maintain fluidity

12. 3. Glycolipids  Lipid + sugar attached  5% membrane lipid  For cell recognition glycolipid

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

14. 2. Peripheral Proteins  Attached loosely to membrane  Functions  Functions: support, enzymes, movement, linkage peripheral protein

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

16. Transport

17. Receive chemical messages

18. Maintain cell shape

19. Enzyme activity

20. Intercellular joining

21. Cell-cell recognition “ID tags”