1. Plasma Membrane Function – physical barrier for the cell; separates internal and external environments; selective permeability Location – surrounding the cell, outer surface

2. Nucleus – Function – control center of the cell; contains DNA; filled with a fluid called nucleoplasm – Location – center of the cell

3. Nuclear Envelope Function – keeps nuclear contents separate from the rest of the cell; allow for information to get into and out of the nucleus when necessary Location – surrounding the nucleus Nuclear Envelope with pores

4. Nucleolus Function – dense area within the nucleus; produces ribosomal RNA Location – center of the nucleus

5. Mitochondria – Function – site of cellular respiration; the transfer of energy from organic molecules to ATP – Location – scattered in the cytoplasm

6. Ribosomes Function – sites of protein synthesis Location – in cytoplasm and on rough endoplasmic reticulum

7. Rough Endoplasmic Reticulum – Function – allow for the transport of substances throughout the cell – Rough ER – contains ribosomes; functions in protein synthesis – Location – surrounding the nucleus

8. Smooth Endoplasmic Reticulum Function – allow for the transport of substances throughout the cell Smooth ER – doesn’t have ribosomes; functions in lipid synthesis Location – surrounding the Rough ER

9. Golgi Apparatus Function – packaging, modifying and shipping of cellular products Location - in cytoplasm near endoplasmic reticulum

10. Lysosomes – Function – break down/digest bacteria, old or damaged organelles – Location – scattered in the cytoplasm

11. Peroxisomes Function – produce hydrogen peroxide when they break down alcohol and engulf bacteria Location – scattered in the cytoplasm

12. Microtubules/Microfilaments Function – Hollow tubes made of protein, hold organelles in place, maintain cell shape Location – Radiate outward from the center called centrosome near the nucleus

13. Cilia and Flagella Cilia - Short and present in large numbers Flagella - Long extensions of the cell, usually one that helps with the cell moving Function – Assist in movement Location – Outside of the cell

14. Centrioles Function – Two short cylinders of microtubules that organize cell division Location – Near the nuclear envelope *Only in animal cells*