Lipid Bilayer

What do the brown structures represent?

• Phospholipids
• Glycoproteins
• Channel Proteins 
• Cyctoskeleton Filaments

Which part of this phospholipid is hydrophobic?

• fatty lipid tails
• head
• all of it is hydrophobic
• none of it is hydrophobic

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

• Inner part of the bilayer
• Outer part of the bilayer
• At the end of the bilayer
• Goes through each end of the bilayer

What is embedded in the phospholipid bilayer?

• proteins
• salt
• water
• trapped animals

Hydrophobic region of the cell membrane?

• E
• B
• C
• A 

Hydrophilic portion of cell membrane?

• A
• C
• D
• E 

The cell membrane is made up of 

• Polar heads, non-polar tails
• Non-polar heads, polar tails
• Polar heads, polar tails
• Non-polar heads, non-polar tails

This protein binds onto items outside the cell, and causes chemical changes inside of the cell.

• cell surface marker

• transport

• receptor

• enzyme

Phospholipids can form bilayer structures because of their:

• A. Rectangular shapes

• B. Amphipathic nature.

• C. Ability to dissolve well in water.

• D. Inability to associate with other phospholipids.

Cholesterol within membranes functions as a(an) ____________ through its interactions with both hydrophobic and hydrophilic parts of phospholipids.

• A. Stabilize the membrane structure

• B. pH buffer

• C. Energy source

• D. Temperature controller