Cell Membrane

Question 1

• Compose the bulk of the cell membrane

- Glycerol backbone with two fatty acids and a phosphate group

Answer 1

Phospholipids

Question 2

• Fatty acid derivatives of sphingosines
• Backbone of sphingoid bases O-linked to a charged head group and amide-linked to an
  acyl group, commonly a fatty acid

Answer 2

Sphingolipids

Question 3

-Positioned between phospholipid heads to add flexibility and help to make the
membrane impermeable to small water-soluble molecules

Answer 3

Cholesterol

Question 4

Roles

• Membrane receptors
• Cell adhesion molecules
• Transmembrane movement
• Channels, carriers, pores, and pumps
• Enzymes
• Intracellular signaling mediation

Answer 4

Integral Proteins

Question 5

• Attach to integral proteins
  Roles
  -Participate in intracellular signaling
  -Form submembraneous cytoskeleton

Answer 5

Peripheral Proteins