B2.1 Cell Membrane & Transport SL

What is the primary component of cell membranes?

• Glycoproteins

• Cholesterol

• Phospholipids

• Integral proteins

What is the main feature of phospholipid molecules that allows them to form cell membranes?

• They are fully hydrophilic

• They are fully hydrophobic

• They have both hydrophobic tails and hydrophilic heads

• They can replicate autonomously

What is the term used for the movement of water molecules across membranes?

• Simple diffusion

• Active transport

• Osmosis

• Facilitated diffusion

What are aquaporins?

• Pump proteins

• Channel proteins for water

• Glycolipids

• Glycoproteins

Which proteins are involved in facilitated diffusion?

• Integral proteins

• Pump proteins

• Channel proteins

• Peripheral proteins

The sodium-potassium pump is an example of what type of transport?

• Passive transport

• Active transport

• Simple diffusion

• Facilitated diffusion

Which of the following best describes the fluid mosaic model of membrane structure?

• Lipid bilayer with floating proteins

• Rigid layer of protein covering a lipid layer

• Single layer of phospholipids with embedded cholesterol

• Double layer of proteins surrounding lipids

What does the 'fluid' part in the fluid mosaic model refer to?

• The movement of water through the membrane

• The ability of lipids to move within the bilayer

• The rigidity of the membrane

• The solid nature of the membrane

What is the function of cholesterol in animal cell membranes?

• Provides energy for the cell

• Acts as a pump for ions

• Maintains membrane fluidity

• Facilitates the formation of vesicles

What is the main function of glycoproteins and glycolipids in cell membranes?

• Transport of molecules

• Cell-cell recognition

• Providing energy

• Enzymatic activity