Question

Some of the questions have more than one correct answers

1- Select all of the following that are correct regarding lipidrafts.

	A- They include higher concentrations of sphingolipids than thesurrounding membrane
	B- They include higher concentrations of phosphatidylcholinethan the surrounding membrane
	C- They include higher concentrations of cholesterol than thesurrounding membrane
	D- They include higher concentrations of GPI-anchored proteinsthan the surrounding membrane
	E- They localize components of pathways

2- Select all of the following that are in the membrane bilayerasymmetrically (i.e. different composition in two leaflets of amembrane).

	A-Carbohydrates
	B- Proteins
	C- Lipids
	D- Nucleic acids

3-Select all of the following that are true of activetransport.

	A- Some solutes are moved against their concentration gradients,from one side of a membrane to the other, using energy from ATPhydrolysis.
	B- Light-driven pumps can couple the movement of solutes againsttheir concentration gradient to an energy input from light.
	C- moving from higher concentration to lower concentration

4- Which organelle is the major site of new membrane synthesisin a cell?

	A- A mitochondrion
	B- The endoplasmic reticulum
	C- The Golgi apparatus
	D- The nucleus
	E- None of the above

5-Select all of the following protein types that are on BOTHvesicles and target membranes and must interact (directly orindirectly) for fusion to occur.

	A- COPI
	B- COPII
	C-COPIII
	D- Rabs
	E-SNAREs
	F-Clathrin