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cell membrane (plasma membrane) -forms the outer boundary of the cell -contains receptor sites which allow entry of materials that affect cell activity nucleus -control centre of the cell -directs all of the cell's activities -contains hereditary or genetic information nucleolus -small spherical structure within the nucleus -involved in making ribosomal RNA ribosomes -site of protein synthesis -made of RNA and protein cytoplasm -fluid that contains all the parts of a cell inside the cell membrane and outside the nucleus -transport & processing of nutrients, storage of wastes, etc. flagella -whiplike tail with contractile proteins that helps a cell move, e.g., sperm cells cilia -short, hairlike projections from cell membrane with contractile proteins that move in a coordinated fashion to help cell move or to move materials, e.g, cells lining trachea mitochondrion (mitochondria) -the "power plant" of the cell -provides the cell with needed energy in a series of chemical processes called cellular respiration endoplasmic reticulum -network of interconnected canals that carries materials through the cytoplasm -rough has many ribosomes attached to it -smooth synthesizes fats or lipids Golgi apparatus -membrane-bound sacs -stores, modifies, and packages proteins from the RER lysosomes -formed by the Golgi apparatus, contain variety of enzymes that break down large molecules and cell parts within the cytoplasm -found only in animal cells microfilaments -pipelike structures found in the cytoplasm that help provide share and movement for the cells microtubules -composed of proteins, found in cilia & flagella -tiny tubelike fibres that transport materials throughout the cytoplasm plastids -chemical factories and storehouses for food and colour pigments in plant cells, e.g., chloroplasts specialize in photosynthesis, amyloplasts store starch, chromoplasts store colour pigments in fruits and flowers, etc. -composed of cellulose, protects and supports plant cells cell walls 1. 2. 4. 3. 6. 5. 7. 8. 10. 9. 12. 11. 13. 14. 15.