2. transport of substances across living cells, usually from a region of lower concentration to a region of higher concentration, with the use of energy. Energy is used in the process

3. all the building-up reactions occurring within an organism

4. all the breaking-down reactions occurring within an organism

5. having a structure so that some but not all substances can pass through

6. the random movement of molecules due to their kinetic energy

7. a special protein that speeds up chemical reactions inside organisms (biological catalysts)

8. the state of a plant cell being soft because its cytoplasm has shrunk and contracted away from the cell wall through loss of water from the cell

9. a solution with a lower water potential than the cell contents

10. a solution with a higher water potential than the cell contents

11. a solution with the same water potential as the cell contents

12. explaining enzymatic action by comparing it to the relation between a lock and a key

13. the overall speed of the chemical reactions occurring within an organism

14. all of the chemical reactions occurring within an organism

15. the net movement of water across a differentially permeable membrane from a less concentrated to a more concentrated solution

16. the state of a plant cell being swollen because of entry of water molecules

17. the capacity of a solution to give out water, in terms of the energy of the water molecules in it as compared to that of pure water

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