Endoplasmic reticulum

Question 1

ER

Answer 1

• complex system of parallel double membrane,
  which form flattened sacs
  - interconnected fluid-filled spaces
  between them
  - cisternae
• connected with the nuclear envelope
  - allows transport of materials through
  the cell

Question 2

Rough ER - function

Answer 2

package the polypeptide created by the ribosomes into vesicles and transport them to the golgi body

Question 3

Rough ER - structure

Answer 3

• has ribosomes on the surface which synthesise
  the polypeptide chain
  - threaded through the pores in the
  rough ER’r membrane
  - threaded into the liquid-filled cisternae,
  and bends to form a 3D shape
• part of the rough ER membrane can break off to
  create vesicles
  - can carry the polypeptide chain to the
  gogli body

Question 4

Smooth ER - structure

Answer 4

• have membrane without ribosomes
• enzymes on the surface catalyses the synthesis
  of lipids
• cells responsible for secreting / producing
  hormones include large number of smooth ER