Some of the questions have more than one correct answers 1- Select all of the fo

Question

Some of the questions have more than one correct answers

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

A- They include higher concentrations of sphingolipids than the surrounding membrane

B- They include higher concentrations of phosphatidylcholine than the surrounding membrane

C- They include higher concentrations of cholesterol than the surrounding membrane

D- They include higher concentrations of GPI-anchored proteins than the surrounding membrane

E- They localize components of pathways

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

A-Carbohydrates

B- Proteins

C- Lipids

D- Nucleic acids

3-Select all of the following that are true of active transport.

A- Some solutes are moved against their concentration gradients, from one side of a membrane to the other, using energy from ATP hydrolysis.

B- Light-driven pumps can couple the movement of solutes against their 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 synthesis in 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 BOTH vesicles and target membranes and must interact (directly or indirectly) for fusion to occur.

A- COPI

B- COPII

C-COPIII

D- Rabs

E-SNAREs

F-Clathrin

A- They include higher concentrations of sphingolipids than the surrounding membrane

B- They include higher concentrations of phosphatidylcholine than the surrounding membrane

C- They include higher concentrations of cholesterol than the surrounding membrane

D- They include higher concentrations of GPI-anchored proteins than the surrounding membrane

E- They localize components of pathways

Explanation / Answer

1. they are rih in spingolipids, cholestrol and side chain of phospholipids moreover they also localize the components of the pathway

2.phospholipids , glycolipids i.e these are the material present in the membrane

3 A and B are true because they causes the transport against the gradient that is why they requires ATP , moreover light reaction promots formation of ATP so causes active transport

4 ER and golgi apparatus are involved in the membrane syntheis

5 COPI , COPI 2 and clathrin coated vesicles are the right answer. they are target membrane proteins which causes fusion of many molecules for transmission and conduction

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