Cell Membrane and Homeostasis Quiz

What role does the cell membrane play in maintaining homeostasis?

• It acts as a rigid barrier that blocks all substances.

• It allows all substances to freely enter and exit the cell.

• It selectively regulates the entry and exit of substances.

• It only allows water to pass through.

Which of the following substances can freely cross the cell membrane?

• Sodium ions

• Glucose

• Oxygen

• Amino acids

What is the primary structural component of the cell membrane?

• Proteins

• Carbohydrates

• Phospholipid bilayer

• Nucleic acids

How do the hydrophilic heads of phospholipids orient themselves in the cell membrane?

• They form a rigid structure.

• They face inward towards each other.

• They face the extracellular and intracellular fluids.

• They face away from the fluids.

What does the fluid mosaic model of the cell membrane suggest?

• The membrane is a static structure.

• Proteins and molecules are fixed in place.

• The membrane is rigid and immobile.

• Proteins and molecules can move within the membrane.