2.b.iii. Movement of Proteins Between Membranes

Question 1

describe the movement of proteins between the ER and the Golgi Apparatus

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

describe the events that occur in the Golgi Apparatus

Answer 2

as proteins move through the Golgi apparatus, they undergo post-translational modification

Question 3

state the major modification which occurs in the golgi apparatus and describe how it happens

Answer 3

the addition of carbohydrate groups. enzymes catalyse the addition of of various sugars in multiple steps to form the carbohydrates

Question 4

why can the golgi apparatus be compared to a post office

Answer 4

the Golgi apparatus modifies, sorts and packages proteins for secretion

Question 5

describe how proteins move through the golgi discs

Answer 5

protien molecules move through the golgi discs in vesicles which bud off from one disc and fuse to the next one in the stack

Question 6

how to proteins get from the golgi apparatus to the plasma membrane and lysosomes

Answer 6

vesicles that leave the golgi apparatus take protiens to the plasma membrane and lysosomes. vesicles move along microtubules to other membranes and fuse with them within the cell