Exploring Cell Membrane Structure and Function

What is the primary function of the cell membrane?

• To synthesize proteins

• To store genetic information

• To protect the cell from the outside environment

• To produce energy for the cell

Which of the following is NOT a component of a phospholipid?

• Nucleic acid

• Fatty acid tails

• Phosphate head group

• Glycerol backbone

What property does the phosphate head group of a phospholipid have?

• Amphipathic

• Hydrophilic

• Nonpolar

• Hydrophobic

What structure do phospholipids form in water?

• Micelles

• Phospholipid bilayer

• Protein channels

• Single layer

Why do the fatty acid tails of phospholipids avoid water?

• They are hydrophilic

• They are nonpolar

• They are charged

• They are amphipathic

What type of molecules can easily pass through the cell membrane?

• Charged molecules

• Large nonpolar molecules

• Large polar molecules

• Small nonpolar molecules

Which of the following molecules can pass through the cell membrane slowly?

• Chloride ion

• Water

• Glucose

• Oxygen

Which molecule cannot pass through the cell membrane due to its size and polarity?

• Benzene

• Glucose

• Oxygen

• Ethanol

What is an example of a charged molecule that cannot pass through the cell membrane?

• Ethanol

• Sodium ion

• Carbon dioxide

• Benzene

What property of the cell membrane allows it to control what enters and leaves the cell?

• Impermeability

• Semi-permeability

• Permeability

• Flexibility