3A Eukaryotic Cells 2

Question 1

Golgi Apparatus process/ protein transport question (6)

Answer 1

• the RER protein is folded, forms 3-D shape
• proteins packaged into vesicles, which pinch off and transport to Golgi
• vesicles fuse with Golgi
• proteins are modified (adding carb. or lipid group)
• protein is transferred in vesicles from Golgi to cell surface membrane (or different region)
• vesicles fuse with cell surface membrane

Question 2

Exocytosis (3)

Answer 2

• the movement of large molecules out of cells
• by fusing of a vesicle with the cell surface membrane
• process requires ATP

Question 3

rough endoplasmic reticulum function (4)

Answer 3

• function of ribosomes is to make proteins
• RER has a large surface area for the synthesis of all these proteins
• then it stores and transports the proteins within the cell after they have been made
• cells that secrete materials have a large amount of RER (cells producing hormones or digestive enzymes)

Question 4

Smooth Endoplasmic Reticulum function (2)

Answer 4

• synthesis and transport of steroids and lipids

- SER found in testis (make the steroid hormone testosterone) and liver (metabolises cholesterol and other lipids)