Question

1-What is true of people with O blood type?

	A) They possess an enzyme the adds a phospholipid to the surface of red blood cells
	B) They possess an enzyme that adds galactose to glycolipids the surface of red blood cells.
	C) They possess an enzyme the adds N-acetyl glucosamine to glycolipids on the surface of red blood cells.
	D) They lack an enzyme that adds a sugar molecule to glycolipids on the surface of red blood cells.

2-Which of the following is true of sphingolipids?

	A) They are components of cell membranes.
	B) They are used to build cerebrosides and gangliosides.
	C) They help protect cell membranes by forming a chemically resistant outer layer.
	D) All of the above are true

3-Which of the following is true of triacylglycerol AND glycerophospholipids?

	A) Both are made from fatty acids.
	B) Both are membrane lipids
	C) Both are amphipathic lipids
	D) Both are made from isoprene units

Answer 1

1-What is true of people with O blood type?

D) They lack an enzyme that adds a sugar molecule to glycolipids on the surface of red blood cells.

Only O blood type lacks this enzyme. People with blood type A have GalNac transferase and people with blood type B have Gal transferase.

2-Which of the following is true of sphingolipids?

D) All of the above are true.

Sphingolipids are found in the cell membrane. They protect the cell surface from harmful environmental factors. They generally form a mechanically stable and chemically resistant covering. The complex form of sphingolipids form cerebrosides and gangliosides.

3-Which of the following is true of triacylglycerol AND glycerophospholipids?

A) Both are made from fatty acids.

Triacylglycerol and glycerophospholipid both don't have an isoprene unit. Neither are they membrane lipids. Triacylglycerol is hydrophobic and glycerophospholipid is an amphipathic molecule. But both are made of fatty acids. In glycerophospholipid, glycerol is attached to 2 fatty acids and phosphoric acid. While Triacylglycerol have 3 fatty acids with glycerol. This is evident form their name itself.