Chapter 8

3. group of organs that work together to perform a specific function
6. converts the chemical energy stored in food into compounds that are more convenient for the cell to use
8. fundamental concept of biology that states that all living things are composed of cells.
14. cell organelle that stores materials such as water salts proteins and carbohydrates
15. pressure, pressure that must be applied to prevent osmotic movement across a selectively permeable membrane
18. property of biological membranes that allows some substances to pass across it while others cannot
20. unicellular organism that lacks a nucleus
22. specialized structure that performs cellular functions within a eukaryotic cell
25. organism whose cells contain a nucleus
27. process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated
29. group of tissues that work together to perform closely related functions
30. strong, supporting layer around the cell membrane in some cells
31. group of similar cells that perform a particular function
32. diffusion of water through a selectively permeable membrane

1. the structure that contains the cell's genetic material in the form of DNA
2. when the comparing two solutions, the solution with the greater concentration of solution
4. when the concentration of two solutions is the same
5. when comparing two solutions, the solution with the lesser concentrations of solution
7. specific protein to whose shape fits that of a specific molecular messenger
9. water channel protein in a cell
10. flexible double-layered sheet that makes up the cell membrane and forms a barrier between the cell and its surroundings
11. thin flexible barrier that surrounds all cells regulates what enters and leaves the cell
12. process of diffusion in which molecules pass across the membrane through cell membrane channels
13. gives the cell its shape and internal organization and is involved in movement.
16. basic unit of all forms of life
17. internal membrane system found in eukaryotic cells
19. captures the energy from sunlight and converts it into chemical energy
21. fluid portion of the cell outside the nucleus
23. organelle in cells that modifies, sorts, and packages proteins and other materials for storage
24. cell organelle that breaks down lipids carbohydrates and proteins into small molecules
26. cell organelle consisting of RNA and proteins found throughout the cytoplasm in a cell
28. relatively constant internal physical and chemical conditions that organisms maintain