1. Cell Theory: a unifying theory that describes all cells
1. All living things(organisms) are composed
of cells
2. Cells are the basic units of structure and
function for living things.
3. All cells come from previously existing
cells.

2. Modern Cell Theory 4. The activity of an organism depends on the
total activity of independent cells.
5. Energy flow occurs within cells.
6. Cells contain hereditary information(DNA),
which is passed from cell to cell during cell
division.
7. All cells are basically the same in chemical
composition in organisms of similar species.

3. Cell Membrane Homeostasis: in living things the maintenance
of a stable internal environment, as a response to a
changing external environment
How does the cell membrane regulate homeostasis? the cell membrane only allows certain
substances to cross it. The internal cell environment will stay stable.

4. Cell Size
As a cell gets larger, the surface area of the cell membrane is no longer large enough to allow for the efficient..
1. removal of wastes
2. acquisition of food

5. Effect of solution Concentration on Animal & Plant Cells
plasmolysis: when plant cells are placed in a hypertonic
solution, and the cell membrane shrinks away from the
cell wall.
cytolysis: when animal cells are placed in a hypotonic
solution, and take in enough water to burst.
turgor: water pressure inside a plant cell causes the cell
membrane to press against the cell wall
turgid= in hypotonic solutions the plant cells are rigid
flaccid= in isotonic solutions cells are wilted
plasmolyzed= in hypertonic solutions cells are permanently
wilted