BIOLOGY

6. Covers the thin cell membrane and is made up of tough cellulose which strengthens the cell
7. A group of similar cells
9. An enzyme found in saliva
12. When a cell becomes swollen with water
13. Chemicals that speed up reactions
14. Living organisms that are made up of more than one cell
17. When the solutions on each side of cell membranes are the same concentration
18. Movement of water molecules from an area of high water concentration to an area of low water concentration across a partially permeable membrane
19. Uses a beam of electrons instead of light rays to see the structures inside cells in detail
20. When animals cells become swollen and burst

1. When plant cells placed into a concentrated sugar or salt solution water passes out of the cells by osmosis
2. The basic units of which all living organisms are made
3. A thin skin around the cell that gives the cell its shape and controls what goes into and out of the cell
4. When enzymes break down large food molecules into smaller ones inside the gut
5. The uptake of substances by cells against a concentration gradient
8. Undifferentiated cells that are capable of developing into many different types of cells
10. Important proteins called biological catalysts that lower activation energy of reaction hence speeding it up
11. Cells that carry out photosynthesis
15. A single cell organism
16. The net movement of particles from a higher concentration to a lower concentration until they are spread out evenly