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*