Chapter 7: Membrane Structure and Function

The plasma membrane allows some substances to cross it more easily than others. What is this called

• Fluid Permeability

• Amphipathic permeability

• Selective permeability

• Cross section permeability

What does an amphipathic molecule

• Two hydrophobic regions

• Two hydrophilic regions

• One hydrophobic and one hydrophilic region

As temperature decreases, the membrane and it’s phospholipids

• Liquidates and become loose

• Solidifies and pack closely together

• Evaporates and pack closely together

• Becomes more fluid

The fluidity of a membrane affects both its permeability and the ability of membrane proteins to move to where their function is needed

• True

• False

What is the difference between channel and carrier proteins

• Channel proteins transfer small and polar solutes across the membrane whereas carrier proteins transfer molecules against the concentration gradient, requiring energy

• Channel proteins transfer molecules against the concentration gradient, requiring energy, whereas carrier proteins transfer small and polar solutes across the membrane.

What are aquaphorins?

• Channel proteins that facilitate passage of water through the membranes

• proteins that change shape

• Channel proteins that facilitate passage of atomic ions

Which is hypotonic, isotonic, and hypertonic

• 1- hypotonic, 2- isotonic, 3- hypertonic

• 1- hypertonic, 2- isotonic, 3- hypotonic

• 1- isotonic, 2- hypertonic, 3- hypotonic

• 1- hypotonic, 2- hypertonic, 3- isotonic

What is happening in step 3

• Na+ binds to the sodium potassium pumps

• K+ is released

• Phosphorylation leads to a change in protein shape, reducing its affinity for Na+ which is released outside

What is happening

• Phagocytosis

• Pinocytosis

• Receptor Mediated Endocytosis

What is facilitated diffusion

• A transport protein speeds the movement of water or a solute across a membrane

• A transport protein slows the movement of water or a solute across the membrane

• Facilitate the diffusion of ions