Cell Membrane Structure and Function

Hydrophobic region of the cell membrane?

• E
• B
• C
• A 

Phospholipid heads are...

• Hydrophobic
• Hydrophilic

True or False: Large molecules, such as glucose, can easily pass through the cell membrane without any help...

• True: They pass right through.
• False: They need a protein channel.

Part of the plasma membrane responsible for cell recognition... 

• C
• E
• B
• D

True or False: Phospholipids can move laterally along the plane of the membrane. 

• True
• False

Why are unsaturated fatty acids able to best keep the membrane more "fluid"?

• Unsaturated fatty acids are more polar than saturated fatty acids. 
• The kinks in the tails of the unsaturated fatty acids prevent a dense network of lipids. 
• Unsaturated fatty acids are solid at room temperature. 
• The kinks in the tails of the unsaturated fatty acids make the region more dense. 

What type of molecule has the most difficult time passing through the membrane? 

• small & hydrophobic
• small & hydrophilic
• large & hydrophobic
• large & hydrophilic

Which letter indicates an integral protein?

• E
• F
• H
• I

When looking at the cell membrane, where are the lipid heads located?

• Floating between bilayer levels
• Outer part of the bilayer
• Inner part of the bilayer
• Located at different parts throughout the bilayer

Proteins that are only temporarily associated with the membrane are known as _____________________________.

• Peripheral membrane proteins

• Tertiary membrane proteins