Cells and Metabolism

3. the series of reactions that occur in the mitochondria during aerobic respiration; another name for the krebs cycle
5. muscle that is not under our conscious control
8. a protein that increases the speed of chemical reactions
9. the site of cellular respiration
11. the energy required to get a chemical reaction started
13. an enzyme that breaks down fats
14. the transport of materials into or out of a cell in membrane-bound sacs
17. a nerve cell
18. tissue that forms the outer part of the skin and lines hollow organs
20. the process by which a cell surrounds and takes in solid particles
21. a group of cells that are similar in structure and function
23. a lipid molecule that contains a phosphate group

1. a difference in concentration of a solution
2. a molecule that stores energy in cells
4. a molecule upon which an enzyme acts
6. all chemical reactions occurring in a living organism
7. a protein that allows ions, water and small molecules to pass through the cell membrane
10. tissue providing support for body organs
12. chemical reactions that break down large organic molecules into smaller ones, with the release of energy
15. a membrane that forms the external boundary of a celll
16. a small membrane-bound cavity in the cytoplasm of a cell
19. the diffusion of water molecules through a semi-permeable membrane
22. the ions or inorganic molecules required by enzymes to catalyse a reaction