Cell Structure and Function

What is phagocytosis?

• The release of waste materials
• The uptake of water
• The movement of ions
• The engulfing of solid particles by the cell

What process is responsible for the uptake of fluids and dissolved solutes into the cell?

• Phagocytosis
• Exocytosis
• Osmosis
• Pinocytosis

What is the significance of selective permeability?

• Prevents all molecules from entering
• Allows unrestricted flow of molecules
• Protects the nucleus
• Allows only certain molecules to pass through

What is the direction of movement in simple diffusion?

• From low to high concentration
• Random movement only
• Against the gradient
• From high to low concentration

What does the Na+/K+ pump do during active transport?

• Lets ions diffuse freely
• Stores ions in vacuoles
• Blocks ion movement
• Transports sodium out and potassium into the cell