Cells Chapter 3. Cells The Cell Theory Emerges  Modern cell theory All organisms consists of one or more cells Each new cell arises from division of.

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Presentation transcript:

Cells Chapter 3

Cells

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

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

Prokaryotic Cell Note what it is lacking

Eukaryotic Cell

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

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

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

Osmosis

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

Fig (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.

Hydrostatic Pressure in Plants

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

Osmoregulation

Woman Dies of Water Intoxication “Hold Your Wee for a Wii Contest”