Cell Membrane Structure and Function

What are the 2 major types of macromolecules found in the cell membrane?

• Lipids and Proteins

• Lipids and ATP

• Proteins and Carbohydrates

• Lipids and Carbohydrates

What is the function of cholesterol in the membrane?

• Stabalization

• Communication

• Forming channels

• Cell signaling

Which lipids make up the majority of the membrane and function as the barrier to large polar molecules

• Cholesterol

• Glycolipids

• Phospholipids

• Fibrous lipids

Which is true of phospholipids

• They have a polar phosphate group attached to the glycerol

• they are diglycerides

• The molecule is amphipathic

• All of these

Phospholipids in the membrane arrange themselves into a double layer, which correctly describes this arrangement

• The hydrophobic tails are in the middle and the hydrophilic heads line the inside and outside of the cell

• The hydrophilic tails point out and the hydrophobic heads line the inside of the cell

• The hydrophobic tails contact the water on the inside of the cell and the hydrophilic heads contact the water on the outside of the cell

• There is one layer of lipids on the top of the cell and one layer on the bottom of the cell

Aquaporins are proteins that move _______ across the membrane

• Ions

• ATP

• Water

• Sugars

What is the function of fiberous proteins

• Communication

• Move water

• Move ions

• Block ATP

Glycoproteins and glycolipids both contain

• Sugars

• ATP

• Water

• Fatty acids

What is the purple protein pictured

• A channel

• An aquaporin

• A pump

• A glycoprotein

What type of cell transport is pictured

• simple diffusion

• Active transport

• Facilitated transport

• Bulk transport