Some of the questions have more than one correct answers 1- Select all of the fo
ID: 48832 • Letter: S
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