Membrane Transport and Osmosis Quiz

What does it mean for a plasma membrane to be selectively permeable?

• It allows all substances to pass through.

• It allows only water to pass through.

• It allows some substances to pass while blocking others.

• It blocks all substances from passing through.

Which of the following is a passive transport mechanism?

• Endocytosis

• Vesicular transport

• Filtration

• Active transport

What drives the process of filtration in cells?

• Chemical energy

• Electrical gradients

• Magnetic fields

• Physical pressure

How does temperature affect the rate of diffusion?

• Temperature has no effect on diffusion.

• Lower temperature increases diffusion rate.

• Higher temperature decreases diffusion rate.

• Higher temperature increases diffusion rate.

What role do aquaporins play in osmosis?

• They transport ions across membranes.

• They facilitate faster water movement across membranes.

• They slow down osmosis.

• They block water movement.

What is the primary difference between osmotic pressure and hydrostatic pressure?

• Both pressures pull water.

• Osmotic pressure pushes water, hydrostatic pressure pulls it.

• Osmotic pressure pulls water, hydrostatic pressure pushes it.

• Both pressures push water.

What happens to a cell in a hypotonic solution?

• It swells and may burst.

• It remains the same size.

• It shrinks.

• It becomes rigid.

How does a hypertonic solution affect a red blood cell?

• The cell shrinks.

• The cell remains unchanged.

• The cell becomes more flexible.

• The cell swells.

What is the approximate osmolarity of the human body?

• 400 milliosmoles per liter

• 100 milliosmoles per liter

• 200 milliosmoles per liter

• 300 milliosmoles per liter

Why is 0.9% sodium chloride used as a rehydrating fluid?

• It is hypertonic to blood cells.

• It is hypotonic to blood cells.

• It is isotonic to blood cells.

• It is acidic.