Rough and smooth endoplasmic reticulum

Question 1

What is the rough endoplasmic reticulum?

Answer 1

Is an internal system of flattened membranous sacs (cisternae)
Are continuous with the nuclear membrane

Question 2

What is the RER covered in?

Answer 2

Covered in ribosomes
Accounts for the ‘dotted’ appearance and gives in its name

Question 3

What is the function of the rough endoplasmic reticulum?

Answer 3

Protein synthesis
Transport of proteins

Question 4

Why are rough endoplasmic reticulum present in large numbers in cells?

Answer 4

Can synthesise large quantities of protein

Question 5

What is the smooth endoplasmic reticulum?

Answer 5

Is similar to the RER but has no ribosomes

Question 6

What is the function of the smooth endoplasmic reticulum?

Answer 6

Synthesis of lipids
Transport of lipids

Question 7

Why do some cells have an extensive ER?

Answer 7

Store large quantities of carbohydrate, protein or fat
Includes liver and secretory cells
Need them to synthesis proteins and lipids