Chapter 5

Question 1

What holds phospholipids within the plama membrane together?

Answer 1

hydrophobic interaction

Question 2

What enhances fluidity of the membrane?

Answer 2

Unsaturated hydrocarbon tails

Question 3

What embeds in plasma membrane that acts as a temperature buffer?

Answer 3

Cholesterol

Question 4

What do proteins do to plasma membrane?

Answer 4

transport molecules
enzymatic activity
signal transduction
cell-cell transduction
intracellular junctions

Question 5

Integral proteins have what?

Answer 5

oen or more regions embedded in or transversing through the plasma membrane

Question 6

Peripheral proteins? not embedded in plasma membrane

Answer 6

not embedded in plasma membrane

Question 7

What is glycosylation important for?

Answer 7

Cell-cell recognition

Question 8

What do differences in glycosylation account for? (4 things)

Answer 8

• allow cells to properly differentiate during development
• distinguish different blood types
• identifies “forgeign” cells
• tissue rejection

Question 9

What are aquaporins?

Answer 9

integral membrane proteins that form pores in the cell membrane and allow water to diffuse acros the otherwise hydrophobic cell membrane

Question 10

What is endocytosis?

Answer 10

transport of particles into the cell

Question 11

What are the three types of endocytosis and what do they do?

Answer 11

Phagocytosis- cell eating
Pinocytosis- cell drinking
Receptor-mediated- requres binding to specific receptors