Cellular Sorting and Digestion Organelles

Revision sheet excerpt

Course Outline

  1. Golgi apparatus structure and regions
  2. Golgi vesicles and cis trans faces
  3. Golgi membrane composition and asymmetry
  4. Golgi functions: glycosylation and processing
  5. Golgi sorting, SNAREs and vesicle fusion
  6. Lysosomes: structure, enzymes and pH
  7. Lysosomal membrane proteins and transporters
  8. Lysosomal matrix and enzyme targeting
  9. Lysosome classification: autophagy and heterophagy

1. Golgi apparatus structure and regions

Key Concepts & Definitions

  • Golgi apparatus : A eukaryotic organelle near the nucleus that processes and sorts proteins and lipids through stacked membrane cisternae.
  • Dictyosome : A Golgi unit made of a stack of curved, membrane-bound sacs that are separated by hyaloplasmic bands and stabilized by cytoskeletal elements.
  • Hyaloplasmic band : A cytosolic gap between adjacent Golgi sacs that separates the cisternae within a dictyosome.
  • Microtubule stabilization : A structural support role where microtubules help maintain the organization of Golgi cisternae.
  • Actin microfilament stabilization : A structural support role where actin filaments help stabilize the Golgi cisternae arrangement.

Essential Points

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Quiz preview

1. Which Golgi face receives cargo from the ERGIC and is also called the CGN face?

2. What is the main structural feature of the Golgi apparatus that consists of a stack of curved, membrane-bound sacs stabilized by cytoskeletal elements?

3. Which cytoskeletal elements help stabilize the organization of Golgi cisternae?

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Flashcards preview

Golgi apparatus regions — key?

Cis, medial, trans; each has distinct functions.

Golgi apparatus structure

Stacked membranes near nucleus that process proteins.

Cis vs trans faces — difference?

Cis receives ER cargo; trans sorts and ships it out.

Dictyosome composition

Multiple sacs separated by hyaloplasmic bands.

Hyaloplasmic band

Space between Golgi sacs.

Golgi functions

Glycosylation and protein processing.

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The quiz contains 11 multiple-choice questions with detailed corrections and explanations for each answer. Ideal for testing your knowledge and identifying gaps.

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