Biology Module 3

3. The movement of molecules from an area of higher concentration to an area of lower concentration.
5. A solution whose concentration of solute is lower than inside the cell.
8. Units inside all cells which perform certain functions/tasks.
10. The cell membrane is flexible and has lots of proteins in it.
17. Cells that don't have a nucleus nor any membrane-bound organelles.
20. A solution whose concentration of solute is the same as inside the cell.
22. A mode of transport that does not require the cell to use any energy.
24. The property of a membrane to only allow certain substances to pass across it. (Some things can pass through.)
25. Molecules which do not dissolve in water; "water fearing."

1. Organisms that have only one cell.
2. The difference in the concentration of molecules on one side of a membrane as compared to the other side.
4. Organisms that have more than one cell.
6. The barrier around all cells which protects them from the outside world.
7. The two-layer orientation of the cell membrane made up of phospholipids.
9. The theory that cells are the basic units of structure and function for all life.
11. The state of being equal or even.
12. Deoxyribonucleic acid; DNA.
13. Cells that contain a nucleus and membrane-bound organelles.
14. The study of cells.
15. A solution whose concentration has a higher concentration of solute than inside the cell.
16. Molecules which dissolve in water; "water loving."
18. Requires the cell to use energy in order to move molecules across the membrane.
19. The types of lipid which make up the cell membrane.
21. A protective layer that surrounds the cell membrane.
23. The process of making molecules by using absorbed molecules.