Lecture 2

Question 1

Endocytosis

Answer 1

• uptake of material into a cell via vesicles

Question 2

Exocytosis

Answer 2

• release of material from the cell via vesicles

Question 3

Phagocytosis

Answer 3

• extensions of the plasma membrane (pseudopodia)

- bacteria or cell debris

Question 4

Pinocytosis

Answer 4

• plasma membrane indents to form an endocytic vesicles

- nonspecific process

Question 5

Steps of Phagocytosis

Answer 5

1. ) recognition
2. ) attachment
3. ) pseudopodia ingests bacteria
4. ) fusion of lysosome
5. ) destruction
6. ) release

Question 6

Receptor-mediated Endocytosis

Answer 6

• receptors bind ligands
• clathrin recruited to membrane
• clathrin-coated vesicle is formed

Question 7

Driving Forces for Non-vesicular Transport

Answer 7

1. ) chemical
2. ) electrical
3. ) electrochemical

Question 8

Simple Diffusion

Answer 8

• passive movement of molecules through a biological membrane’s lipid bilayer

Question 9

Factors Influencing Rate of Diffusion

Answer 9

1. ) magnitude of driving force
2. ) membrane surface area
3. ) membrane permeability

Question 10

Osmosis

Answer 10

• net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane

Question 11

Membrane Transport Proteins

Answer 11

• facilitated diffusion
  a. ) carriers
  b. ) channels
• specific

Question 12

Active Transport

Answer 12

• uphill transport
• utilize energy
  a. ) primary
  b. ) secondary