2. a thin, flexible sheet-like structure made of lipids and proteins. It surrounds the cytoplasm. It is differentially permeable and controls the movement of materials into and out of cells

3. a thick cellulose layer covering the cell membrane of plant cells. It can support and give shape to plant cells. It also protects the cell

4. a thread-like structure in the cell nucleus. It carries genetic information and controls cellular activities

5. a substance inside a cell, which contains the nucleus and other cell organelles. It provides a site for many chemical reactions to take place inside cells

6. a tool for magnifying and observing small objects

7. an organelle inside the cell for converting energy. It contains enzymes which help to release and transfer energy during respiration

8. a structure inside cells that controls cellular activities. It is bounded by a nuclear membrane and contains thread-like chromosomes

9. structures inside a cell that carry out particular functions

10. starch grains and crystals of insoluble wastes inside a cell

11. a sac or space inside the cytoplasm often for storage. It may hold dissolved chemicals, food particles and sometimes solid granules. It is surrounded by a membrane which usually controls the movement of materials into and out of it

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