Secretion of Proteins

Question 1

What are the 2 pathways for the localisation of proteins to organelles

Answer 1

Direct pathway - proteins are moved from cytosol to mitochondria nuclei and peroxisomes

Secretory pathway- Proteins are moved from the ER

Question 2

What are the 2 types of secretion

Answer 2

Constitutive secretion

• All cells
• Continual exporting some substances

Regulated Secreation

• Specialised secreaotry cells
• Substnces stored on secretary vesicles for release in response to signal

Question 3

What is the pathway for proteins to move through a cell

Answer 3

ER
GOLGI
FINAL DESTINATION

Question 4

What are pancreatic cells

Answer 4

Major exocrine organ associated with the digestive tract

Question 5

What are the islets of langerhans

Answer 5

they are endocrine compoanats and are locatednin the tail of the pancreas

Question 6

What does a pancreatic acinar cells have

Answer 6

Large amounts of RER

Large secretary granules

Question 7

What are the 6 stages of secretion

Answer 7

1. Initiation of protein synthesis
2. Synthesis segregated from cytosolic proteins
3. Processing of proteins
4. Packaging and condensation
5. Storage in vesicles
6. Release via exocytosis