1. Cell Transport
Miss Fletcher
January 2013
Inter Community School
2. 2.4.7. Explain how vesicles are used to transport materials
within a cell between the rough endoplasmic reticulum, Golgi
apparatus andplasma membrane.
Key words
Golgi apparatus
Rough endoplasmic
reticulum
Move
Fuse
Bud
Products
Hormones
Exocytosis
3. Question: Outline how vesicles are used to
transport materials secreted by a cell (6 marks).
Vesicles formed from _________________transport proteins
to______________, these vesicles fuse with membranes of
_______________and proteins are processed as they move
through_________________;
• vesicles __________and leave Golgi apparatus;
• vesicles _________through cytoplasm;
• vesicles ________with plasma membrane;
• the contents released to outside of cell /____________;
• cells use vesicles to secrete substances such as
_______/digestive enzymes/other appropriate example;
• vesicles may contain cell __________other than proteins;
4. Answer: Outline how vesicles are used to
transport materials secreted by a cell (6 marks).
Vesicles formed from rough endoplasmic reticulum transport
proteins to Golgi apparatus; these vesicles fuse with
membranes of Golgi apparatus; proteins are processed as
they move through Golgi apparatus;
• vesicles bud off and leave Golgi apparatus;
• vesicles move through cytoplasm;
• vesicles fuse with plasma membrane;
• the contents released to outside of cell / exocytosis;
• cells use vesicles to secrete substances such as
hormones/digestive enzymes/other appropriate example;
• vesicles may contain cell products other than proteins;
5. 2.4.8. Describe how the fluidity of the membrane allows it to
change shape, break and re-form during endocytosis and
exocytosis.
6. Question: Describe the process of endocytosis. [5]
Answer Endocytosis occurs when a membrane encloses a target particle;
• fluidity of membrane permits movement of membrane;
• membrane sinks inwardly/forms pit/invaginates to enclose particle;
• membrane seals back on itself / edges fuse;
• one membrane layer / two phospholipid layers enclose particle making
vesicle;
• inner phospholipid layer of (original) membrane becomes outer
phospholipid layer of vesicle membrane;
• outer phospholipid layer of (original) membrane becomes inner
phospholipid layer of vesicle membrane;
• vesicle breaks away from membrane/moves into cytoplasm;
• changes in membrane shape require energy;
• specific example of endocytosis (e.g. pinocytosis, phagocytosis); [5 max]
• Accept any of the above points in an annotated diagram.
7. Task
Using the language of the answer create a short
video or animation using your model to show
endocytosis.
