2F - The Protein Secretory Pathway

Question 1

exocytosis

Answer 1

a type of bulk
transport that moves large
substances out of a cell
- contents of a vesicle are released from a cell

Question 2

the protein secretory pathway involves…

Answer 2

various different organelles that produce, fold, modify, and package proteins, eventually exporting them from the cell via the process
of exocytosis.

Question 3

stages involved in exocytosis

Answer 3

A vesicle containing secretory products is transported to the plasma membrane.
2 The membrane of the vesicle fuses with the plasma membrane.
3 The secretory products are released from the cell into the extracellular environment.

Question 4

what main organelles are part of the secretory pathway

Answer 4

ribosome, rer, golgi apparatus and transport and secretory vesicles

Question 5

ribosomes role in secretory pathways

Answer 5

site of protein synthesis
assemble polypeptide
chains from amino acids by translating mRNA.

Question 6

rer’s role in secretory pathways

Answer 6

Folds and transports proteins
- if protein is going to be secreted, the ribosome is usually attached to the rer, allows for the correct folding

Question 7

transport protein’s role in secretory pathways

Answer 7

contain protien
buds off from rer and attatches to golgi membrane
releases the protein into its lumen.

Question 8

golgi apparatus’ role in secretory pathways

Answer 8

Modifies and packages proteins
- proteins can have chemical groups (e.g. sugar molecules) added or removed
- often packaged into secretory vesicles for export or
released directly into the cytosol for use by the cell.

Question 9

secretory vesicles role in secretory pathways

Answer 9

contains protein
buds of golgi apparatus
travels through cytoplasm, attaches to plasma membrane
- releases proteins into extracellular environment through exocytosis