Unit 1.2.b.iii

Question 1

What happens to proteins once they are in the ER?

Answer 1

Once the proteins are in the ER, they are transported by vesicles that bud off from the ER and fuse with the Golgi apparatus

Question 2

What happens to proteins as they move through the Golgi apparatus

Answer 2

They undergo post-translational modification

Molecules move through the Golgi discs in vesicles that bud off from one disc and fuse to the next one in the stack. Enzymes catalyse the addition of various sugars in multiple steps to form the carbohydrates.

Question 3

What happens to vesicles once the leave the Golgi apparatus?

Answer 3

Vesicles that leave the Golgi apparatus take proteins to the plasma membrane and lysosomes

Vesicles move along microtubules to other membranes and fuse with them within the cell