Endocytosis and Exocytosis

Question 1

ENDOCYTOSIS

Answer 1

• Bulk transport into a cell known as endocytosis.
• Solids are transported by phagocytosis; liquids by phagoctosis

Question 2

How does endocytosis work?

Answer 2

• The cell surface membrane first invaginates (bends inwards) when it comes in contact with the material to be transported
• The membrane enfolds the material until eventually the membrane fuses, forming a vesicle
• The vesicle pinches off and move into the cytoplasm to the transfer material for further processing within the cell.
• Vesicles, usually formed by golgi apparatus, moves towards and fuses within the cell surface membrane.
• The contents of the vesicle are then released outside of the cell
• Energy in the form of ATP is required for movement of vesicles along the cytoskeleton, changing the shape of the cells to engulf materials and the fusion of cell membranes the vesicles form or meet the cell membrane.

Question 3

What is Exocytosis?

Answer 3

• Excytosis is the process by which materials are removed from, or transported out of the cells

Question 4

How does exocytosis work?

Answer 4

• Vesicles, usually formed by the golgi apparatus, move towards and fuse with the cell surface membrane.
• The contents of the vesicle are then released outside of the cell.

Question 5

DIFFERENCES between Endoyctosis and exocytosis

Answer 5

ENDOCYTOSIS
- Two types (phagocytosis and pinocytosis)
- Bulk transport into cells
- forms a small sac (endocytic vacuole)
- engulfs materials
- vesicle pinches off and moves into the cytoplasm to transfer material

EXOCYTOSIS
- Bulk transport out of the cells
- secretory vesicles are formed
- removes materials
- contents of vesicles are released outside of the cell

Question 6

SIMILARITIES between Endoyctosis and exocytosis

Answer 6

• Both require energy
• forms of active transport
• forms a vesicle