Peroxisomes, Golgi, Lysosomes and Endo and Exocytosis Flashcards
What is the function of peroxisomes?
To perform redox reactions that break down toxic peroxides.
Why do peroxisomes need compartmentalised?
As they generate reactive oxygen species
What directs import proteins to peroxisomes?
A short signal sequence.
Where are the enzymes found in peroxisomes generated?
The ER and cytosol
What is the precursor vesicle (peroxisomes)?
The vesicle containing proteins that bud from the ER.
How are precursor vesicles converted to peroxisomes?
Through the uptake of lipids and cytosol.
Where do vesicles deliver cargo?
Between cell compartments, into the cell and out of the cell.
What is exocytosis?
The process of releasing particles to the outside of the cell. The inside of the vesicle is topologically equivalent to the outside of the cell.
What is endocytosis?
The process of particles being taken into the cell.
What are the three different coatings found on vesicles?
Clathrin, COP I and COP II
What is the structure of the golgi?
A cis and trans face separated by the cisterna. The cis face receives the vesicle from the ER and the trans face produces a secretory vesicle.
What is the lysosome?
The site of digestion.
What is the pH of the lysosome?
pH 5
What process is used to acidify the lysosome?
A proton pump.
What is present in lysosomes that degrades the vesicles?
Hydrolases
