Cells and Body Systems

2. tiny hair-like structures on the cell membrane of a single-celled organism; allows organism to move and collect food
4. a group of related organs that work together to perform the same function
7. basic unit that makes up living things
8. a group of related tissues that work together to perform the same function
10. the parts of a cell
12. rigid, outer layer of the cell; found only in plant cells
14. system of membranes and tubes that twist and turn throughout a cell to make paths for materials to pass
18. membrane-bound sacs that are filled with fluid; store water, food, waste, and other substances
19. small, ball-shaped organelle that breaks down nutrients and old cell organelles; rare in plant cells
20. type of diffusion where water passes through a cell membrane

1. organelle that assembles proteins into compounds; not surrounded by a membrane
3. a large group of similar, specialized cells that work together
5. system of membranes that receive proteins and "ship" them out to other parts of the cell
6. whip-like "propeller" tail that helps a single-celled organism move
9. "brain" of the cell; storehouse of a cell's important information; core of a cell
11. thick fluid located between the cell membrane and the nucleus of a cell
12. thin, flexible covering that surrounds all types of cells
13. large, peanut-shaped organelles known as the "power plants" of the cell
15. movement of particles from an area of higher concentration to an area of lower concentration
16. organelle found only in plants; contain green pigments that absorb sunlight and convert the energy into food
17. a single-celled organism that is housed inside a shell