C3 ER

Question 1

What are the characteristics of smooth ER?

Answer 1

Smooth ER does not have ribosomes and have a tubular appearance.

Question 2

What are the characteristics of rough ER?

Answer 2

Have ribosomes on it’s outer surface and have flattened sacs called cisternae.

Question 3

Functions of rough ER.

Answer 3

1. Modify secretory protein by adding carbohydrates to form glycoprotein.
2. Formation of transport vesicle that buds off from rough ER and travel to Golgi apparatus.
3. Membrane factory for the cells. Synthesis of membrane protein and phospholipids.

Question 4

Functions of smooth ER.

Answer 4

1. Synthesis of lipids and cholesterol needed to make cell membranes.
2. Synthesis of steroid hormones.
3. Detoxification of drugs and poison esp in liver.
4. Storage of calcium ions esp in muscle cells.