What is the primary characteristic of the cell membrane that allows a unicellular organism to move?

• Rigid

• Flexible

• Permeable

• Thick

How does the plasma membrane regulate transport?

• By being impermeable

• By being selectively permeable

• By being fully permeable

• By being rigid

What does the plasma membrane provide for the cytoskeleton?

• Energy

• Nutrients

• Anchoring sites

• Waste removal

What is NOT contained by the plasma membrane?

• Cytoplasm

• Enzymes

• DNA

• Ribosomes

Which of the following is a key function of the plasma membrane?

• It stores oxygen

• It binds cells together

• It produces glucose

• It generates light

What is the function of protein channels in the cell membrane?

• Energy production

• Transport of molecules

• DNA replication

• Photosynthesis

Which of the following is NOT a component of the cell membrane?

• Lipids

• Proteins

• Carbohydrates

• DNA

How do carbohydrate chains contribute to the cell membrane's function?

• They provide energy for the cell

• They assist in cell recognition and communication

• They transport molecules across the membrane

• They synthesize proteins

What is the orientation of the lipid molecules in the cell membrane?

• Randomly scattered

• Hydrophobic tails facing inward, hydrophilic heads facing outward

• Hydrophilic tails facing inward, hydrophobic heads facing outward

• Arranged in a single layer

What is the primary function of cholesterol in the cell membrane?

• Energy storage

• Membrane fluidity regulation

• Protein synthesis

• Cell adhesion