Bulk transport Flashcards
1
Q
What is bulk transport?
A
A type of active transport using vesicles instead of proteins
2
Q
Why are vesicles used to transport molecules + not channel/carrier proteins?
A
Since molecules are too large to go through channel or carrier proteins
E.g. hormones, enzymes
3
Q
What is endocytosis process?
A
- Cell surface membrane bends inwards when in contact with material needing to be transported
- Membrane enfolds material until membrane fuses, becoming a vesicle
- Vesicle moves into cytoplasm + transfers material for further processing in cell
4
Q
What is the exocytosis process?
A
- Vesicles, usually formed by golgi apparatus, move towards + fuse with cell surface membrane
- Contents of vesicle are released outside of cell
5
Q
What is the difference between endocytosis + exocytosis?
A
Exocytosis is the reverse of endocytosis
6
Q
Where is ATP needed in bulk transport?
A
- Movement of cells along cytoskeleton
- Changing shape of cells to engulf materials
- Fusion of cell membranes as vesicles form or meet cell surface membrane bends inwards
7
Q
What does bulk transport require?
A
Vesicles + metabolic energy
