THE PLASMA MEMBRANE

Question 1

The following are phospholipids, except:

A. Plasmalogen
B. Lecithin
C. Cephalin
D. Choline

Answer 1

D. Choline

Question 2

The fluid-mosaic model for membrane structure proposes that:

A. the outer and inner faces of the membrane are identical
B. peripheral proteins are situated only on the outer face of the plasma membrane
C. integral proteins are associated with the hydrophobic phase of the bilayer
D. polar and non – polar ends of membrane phospholipids are within the hydrophobic phase of the bilayer

Answer 2

C. integral proteins are associated with the hydrophobic phase of the bilayer

Question 3

Mediated (facilitated) diffusion of substances across cell membranes differs from simple diffusion in that mediated diffusion:

A. requires ATP
B. requires another solute
C. is a one-directional process
D. exhibits saturation kinetics

Answer 3

D. exhibits saturation kinetics

Question 4

Gangliosides are glycolipids found on various cell surfaces. In addition to sphinogosine, their unit composition contains another component called ____.

A. Uronic acid
B. Plasmalogen
C. Triglyceride
D. N – acetylmuramic acid
E. N – acetylneuraminic acid

Answer 4

E. N – acetylneuraminic acid

Question 5

Neutral fats contain mixtures of one or more fatty acids esterified with:

A. Sterol
B. Glycerol
C. Sphinogosine
D. Alcohols of high molecular weight
E. Lecithin

Answer 5

B. Glycerol

Question 6

Phosphatidylcholine is also known as:

A. Lecithin
B. Cephalin
C. Plasmalogen
D. Cardiolipin
E. Sphingomyeline

Answer 6

A. Lecithin