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Biology LibreTexts

7.3C: The Golgi Complex

Skills to Develop

  1. Briefly describe the Golgi complex and state its functions.
  2. Briefly describe how the Golgi complex packages materials for secretion from the cell.

The Golgi complex or Golgi apparatus consists of 3-20 flattened and stacked saclike structures called cisternae. A complex network of tubules and vesicles is located at the edges of the cisternae. The Golgi complex functions to:

  1. sort proteins and lipids received from the ER;
  2. modify certain proteins and glycoproteins; and
  3. sort and package these molecules into vesicles for transport to other parts of the cell or secretion from the cell.

As mentioned above, proteins that have been produced in the rough ER are placed into transition vesicles by the smooth ER. The proteins and glycoproteins within the transition vesicle are then transported to the Golgi complex as the transition vesicles fuse with the Golgi complex membrane. Here the proteins and glycoproteins may be further modified and sorted. Finally the Golgi complex will package these molecules in membrane-bound vesicles for secretion from the cell or transport to lysosomes. The vesicles involved in secretion are called secretion vesicles. These form around the molecules to be secreted as they pinch off of the Golgi complex. The secretion vesicles then fuse with the cytoplasmic membrane to release the proteins and glycoproteins from the cell (see Fig. 33).

(def) (see Fig. 31, Fig. 30, and Fig. 33)

 

 

Concept map for Eukaryotic Cell Structure

Summary

  1. The Golgi complex or Golgi apparatus consists of 3-20 flattened and stacked saclike structures called cisternae. A complex network of tubules and vesicles is located at the edges of the cisternae.
  2. The Golgi complex functions to sort proteins and lipids received from the ER, modify certain proteins and glycoproteins, and sort and package these molecules into vesicles for transport to other parts of the cell or secretion from the cell.

Questions

Study the material in this section and then write out the answers to these questions. Do not just click on the answers and write them out. This will not test your understanding of this tutorial.

  1. Briefly describe the Golgi complex and state its functions. (ans)
  2. Briefly describe how the Golgi complex packages materials for secretion from the cell. (ans)

Contributors

  • Dr. Gary Kaiser (COMMUNITY COLLEGE OF BALTIMORE COUNTY, CATONSVILLE CAMPUS)