Passive and Active Transport Explained

What type of molecules can easily pass through the cell membrane by simple diffusion?

• Polar molecules

• Ions

• Nonpolar molecules

• Large molecules

What drives the movement of molecules in simple diffusion?

• Random collisions

• Pumps

• ATP

• Protein channels

Which type of diffusion involves the use of protein channels?

• Osmosis

• Active transport

• Facilitated diffusion

• Simple diffusion

Why can't ions and polar molecules pass through the cell membrane by simple diffusion?

• They are too small

• They are repelled by the nonpolar fatty acid center

• They are too large

• They require energy

What is the role of aquaporins in osmosis?

• They store water molecules

• They pump water molecules

• They provide a passage for water molecules

• They repel water molecules

What is osmosis?

• The active transport of glucose

• The facilitated diffusion of sodium

• The diffusion of water

• The diffusion of ions

What is required for active transport to occur?

• Equilibrium

• Random collisions

• Protein channels

• ATP

In active transport, molecules move from:

• Inside the cell to outside the cell

• Outside the cell to inside the cell

• Low concentration to high concentration

• High concentration to low concentration

What does 'selectively permeable' mean in the context of the cell membrane?

• No molecules can cross the membrane

• All molecules can cross the membrane

• Only water molecules can cross

• Some molecules can cross while others cannot

Which type of transport does not require energy?

• Pumping

• Facilitated diffusion

• Endocytosis

• Active transport