Cell Membrane Quiz

What is the function of the cell membrane?

• To protect the cell from harmful substances
• To control the movement of molecules in and out of the cell
• To provide structure and support to the cell
• To produce energy for the cell

What does it mean for the cell membrane to be semipermeable?

• It allows all molecules to freely pass through
• It allows only certain molecules to pass through
• It prevents all molecules from entering or leaving the cell
• It allows water molecules to pass through but not other molecules

What is the composition of the cell membrane?

• A single layer of proteins
• A double layer of phospholipids and proteins
• A triple layer of carbohydrates
• A mixture of lipids and nucleic acids

What is the function of phospholipids in the cell membrane?

• To provide energy for the cell
• To transport molecules across the membrane
• To form a barrier between the inside and outside of the cell
• To regulate cell division

Which part of a phospholipid molecule is hydrophilic?

• The polar head
• The fatty acid tail
• Both the polar head and the fatty acid tail
• Neither the polar head nor the fatty acid tail

Which part of a phospholipid molecule is hydrophobic?

• The polar head
• The fatty acid tail
• Both the polar head and the fatty acid tail
• Neither the polar head nor the fatty acid tail

Why is the fluid nature of the cell membrane important?

• It allows the cell membrane to dissolve in water
• It allows the cell membrane to move and change shape
• It prevents molecules from passing through the membrane
• It provides energy for cellular processes

Which molecules can freely pass through the cell membrane?

• Large molecules
• Water molecules
• Charged ions
• Proteins

What do large molecules need to cross the cell membrane?

• Transport proteins
• Lipids
• Carbohydrates
• Nucleic acids

What is the main function of transport proteins in the cell membrane?

• To provide structure to the cell membrane
• To regulate cell division
• To transport molecules across the membrane
• To produce energy for the cell