The Structure of Membranes

Question 1

Define fluid mosaic model

Answer 1

describes the plasma membrane as a fluid combination of phospholipids, cholesterol, and proteins

Question 2

Define integral membrane protein

Answer 2

Span the lipid bilayer (transmembrane proteins)

Nonpolar regions of protein within interior of bilayer

Polar regions of the protein protrude from both sides of the bilayer

Question 3

Define peripheral membrane protein

Answer 3

Anchoring molecules attach membrane protein to surface

Question 4

Define transmembrane protein

Answer 4

• Spans the lipid bilayer

- Hydrophobic amino acids arranged in α helices

Question 5

What happens when the protein is touching the hydrophobic core?

Answer 5

then those amino acids would be nonpolar and hydrophobic. Protein near phosphate heads are polar and hydrophilic

Question 6

List and describe the four components shared by all the membranes in a cell.

Answer 6

-Phospholipid bilayer
      Flexible matrix, barrier to permeability
-Transmembrane proteins
      Integral membrane proteins
-Interior protein network
      Peripheral or Intracellular membrane proteins
-Cell surface markers
      Glycoproteins and glycolipids