Lecture 5 recap

What is the primary structure of the cell membrane?

• Monolayer of lipids

• Tri-layer of proteins

• Single layer of carbohydrates

• Bi-lipid layer

Which type of molecules can easily pass through the lipid bilayer?

• Proteins

• Small non-polar molecules

• Charged ions

• Large polar molecules

What effect does an increase in temperature have on membrane permeability?

• Increases permeability

• No effect

• Makes it impermeable

• Decreases permeability

What role do integral proteins play in the cell membrane?

• Facilitate transport

• Store energy

• Act as receptors only

• Provide structural support

What is the function of cholesterol in the membrane?

• Decreases mechanical stability

• Enhances fluidity

• Increases permeability

• Reduces membrane permeability

What type of transport does not require energy?

• Exocytosis

• Endocytosis

• Facilitated diffusion

• Active transport

What are aquaporins primarily responsible for?

• Catalyzing reactions

• Transporting ions

• Facilitating water movement

• Transporting glucose

What is the primary function of receptor proteins?

• Transport molecules

• Provide structural support

• Receive signals

• Catalyze reactions

What is the role of carbohydrates in the cell membrane?

• Energy storage

• Cell-cell recognition

• Structural integrity

• Transport of ions

What is the main characteristic of facilitated diffusion?

• Requires ATP

• Moves against concentration gradient

• Involves transport proteins

• Is a passive process