Cells Unit Review

10. the movement of particles from an area of high concentration to low concentration
11. all plant and animal cells contain a jelly-like material
12. tiny parts within the cell that have special functions
13. a common stain used on animal cells to make the nucleus visible
14. tiny organelles that help make proteins
16. a special kind of diffusion that involves only the movement of water through a selectively permeable membrane
17. photographs taken with a microscope
19. a device that uses light focussed through several different lenses to form a magnified image of a specimen
21. last name of the scientist who built the first successful light microscope
22. a thin covering that both plant and animal cells possess to keep the cytoplasm together

1. the concept that all cells are created from existing cells
2. where the objective lenses are mounted
3. the "control centre" of the cell
4. If you let the soil around a plant dry out, the plant would begin to ____________
5. the idea that the cell is the basic unit of life
6. a large, sac-like organelle that stores excess food, waste and other substances
7. this has different-sized holes that let different amounts of light pass through the specimen on the stage
8. the inability of water and air to pass through a membrane
9. the movement of substances into and out of a cell
15. this term refers to the property of a barrier that allows only certain substances to pass through it
18. a common stain used to detect the presence of starch
20. the ability of water and air to pass through a membrane