Cells and Metabolism

7. chemical reactions that break down large organic molecules into smaller ones, with the release of energy
10. a small membrane-bound cavity in the cytoplasm of a cell
11. muscle that is not under our conscious control
12. a molecule upon which an enzyme acts
14. all chemical reactions occurring in a living organism
19. a lipid molecule that contains a phosphate group
20. the site of cellular respiration
21. the energy required to get a chemical reaction started
22. the diffusion of water molecules through a semi-permeable membrane
23. a nerve cell

1. the process by which a cell surrounds and takes in solid particles
2. a membrane that forms the external boundary of a celll
3. tissue providing support for body organs
4. tissue that forms the outer part of the skin and lines hollow organs
5. a protein that increases the speed of chemical reactions
6. the ions or inorganic molecules required by enzymes to catalyse a reaction
8. a group of cells that are similar in structure and function
9. large organic molecules made up of fatty acids and glycerol
10. the transport of materials into or out of a cell in membrane-bound sacs
13. a difference in concentration of a solution
15. a molecule that stores energy in cells
16. the series of reactions that occur in the mitochondria during aerobic respiration; another name for the krebs cycle
17. a protein that allows ions, water and small molecules to pass through the cell membrane
18. an enzyme that breaks down fats