1. Cells Chapter 3

2. Cells

3. The Cell Theory Emerges  Modern cell theory All organisms consists of one or more cells Each new cell arises from division of another, preexisting cell A cell is the smallest unit with the properties of life Each cell passes its hereditary material to its offspring

4. All Cells Have: 1.Plasma membrane Controls substances passing in and out of the cell 2.DNA 3.Cytoplasm A semifluid mixture containing cell components 4.Ribosomes

5. Prokaryotic Cell Note what it is lacking

6. Eukaryotic Cell

10. Fig. 5-8 (a-c), p. 83

11. Fig. 5-8 (d-e), p. 83

13. Osmosis  Osmosis The movement of water down its concentration gradient – through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration

14. Osmosis

15. Fig. 5-17a, p. 89 Tonicity Experiment 2 % sucrose10% sucrosewater

16. Fig. 5-17 (b-d), p. 89 B Red blood cells in an isotonic solution do not change in volume. C Red blood cells in a hypertonic solution shrivel because water diffuses out of them. D Red blood cells in a hypotonic solution swell because water diffuses into them.

17. Hydrostatic Pressure in Plants

18. Are paramecium’s surroundings hypotonic, hypertonic, or isotonic?

19. Osmoregulation

21. Woman Dies of Water Intoxication- 2007 “Hold Your Wee for a Wii Contest”