Phospholipids and Their Functions

What are phospholipids made of?

• Glycerol and three fatty acids

• Glycerol and a phosphate group

• Glycerol, two fatty acids, and a phosphate group

• Two fatty acids and a phosphate group

Which of the following is NOT a component of phospholipids?

• Glycerol

• Three fatty acids

• Two fatty acids

• A phosphate group

What is the significance of the lipid bilayer in cellular function?

• It stores nutrients

• It provides structural support

• It regulates the passage of substances

• It synthesizes proteins

What part of the phospholipid is polar?

• The tails

• The head

• The fatty acids

• The entire molecule

Where are the nonpolar tails located in the phospholipid bilayer?

• Outside the cell

• Inside the phospholipid bilayer

• Closest to the water

• On the surface of the cell

What is the function of the polar heads in the phospholipid bilayer?

• To repel water

• To attract water

• To store energy

• To create a barrier

Why can't substances that dissolve in water pass through the plasma membrane?

• They are stopped by the polar surface.

• They are stopped by the nonpolar middle.

• They are too large to pass through.

• They are repelled by the hydrophilic head group.

What is the characteristic of the middle of the phospholipid bilayer?

• Polar

• Hydrophilic

• Nonpolar

• Charged

What prevents water-soluble substances from passing through the phospholipid bilayer?

• The polar surface

• The hydrophilic head group

• The nonpolar middle

• The lipid core

What characteristic of cholesterol helps maintain homeostasis in a cell?

• Its ability to create tunnels.

• Its nonpolar nature.

• Its sugar coating.

• Its partial embedding in the bilayer.

Tags

NGSS.HS-LS1-3