3. nucleolus

4. nucleolus – portion of chromatin associated with production of ribosomes

5. chromatin

6. chromatin - primarily strands of DNA that contain the instructions for the control of cell functions by production of enzymes.

7. nuclear envelop

8. nuclear envelop – a double plasma membrane that separates nucleoplasm from the rest of the cell.

9. mitochondrion

10. mitochondrion – membranous structure that contains the enzymes necessary for cellular respiration which releases energy used by the cell to power its activities.

11. Golgi body

12. Golgi body (apparatus) – series of flattened sacs where proteins are prepared for export from the cell.

13. Endoplasmic reticulum

14. endoplasmic reticulum – series of tubes (channels) responsible for the transport of large molecules that cannot normally pass through the cell membrane.

15. ribosomes

16. ribosomes – tiny granules that provide the site for the synthesis of proteins.

17. vacuole

18. vacuole – a chamber surrounded by a plasma membrane used for storage, primarily water.

19. lysosomes

20. lysosomes – tiny storage chambers used to hold digestive (hydrolytic) enzymes. These enzymes are used to digest food and destroy invaders.

21. microbodies

22. microbodies – similar to lysosomes except that they hold enzymes that are not usually used in digestion.

23. microtubules

24. microtubules – tiny protein tubes; part of the cytoskeleton used primarily for support.

25. microfilament

26. microfilament – tiny polymers; part of the cytoskeleton associated with cellular movement.

27. centriole

28. Centrioles – a cluster of fibers (made of the same material as the cytoskeleton) that are found only in animal cells and insure the chromosomes are properly positioned during mitosis.

29. cell membrane

30. Cell membrane – composed of proteins, phospholipids, and carbohydrates; it regulates the movement of materials in and out of the cell.

31. hyaloplasm

32. Hyaloplasm – the liquid part of the cytoplasm that serves as a medium in which the other organelles are suspended.