Passive transport: diffusion and osmosis

What is the main characteristic of passive transport?

• It requires energy from ATP.

• It moves substances from low to high concentration.

• It involves active participation of the cell.

• It moves substances from high to low concentration without energy.

What is a concentration gradient?

• A difference in energy levels across a cell.

• A difference in cell size across a tissue.

• A difference in molecule concentration across different areas.

• A difference in temperature across a cell membrane.

Why is the cell membrane described as selectively permeable?

• It allows all substances to pass through.

• It blocks all substances from passing through.

• It regulates what can pass through based on specific criteria.

• It allows only water to pass through.

What role does passive transport play in cellular function?

• It depletes the cell's energy reserves.

• It helps maintain homeostasis by balancing molecule concentrations.

• It causes cells to shrink.

• It prevents any movement of substances across the cell membrane.

Which of the following is NOT a type of passive transport?

• Active transport

• Osmosis

• Facilitated diffusion

• Simple diffusion

What is simple diffusion?

• Movement of large polar molecules through the cell membrane.

• Movement of small nonpolar molecules through the cell membrane.

• Movement of water molecules through a semi-permeable membrane.

• Movement of molecules against the concentration gradient.

How do large polar molecules pass through the cell membrane?

• By osmosis.

• With the help of protein channels or carrier proteins.

• By using energy from ATP.

• Through simple diffusion.

What is osmosis?

• Movement of glucose through the cell membrane.

• Movement of water molecules through a semi-permeable membrane.

• Movement of ions through a protein channel.

• Movement of oxygen and carbon dioxide in the lungs.

Which process helps glucose pass through the cell membrane?

• Active transport

• Simple diffusion

• Facilitated diffusion

• Osmosis

What is the main difference between simple and facilitated diffusion?

• Simple diffusion involves small nonpolar molecules, facilitated involves large polar molecules.

• Facilitated diffusion requires energy, simple does not.

• Facilitated diffusion involves small nonpolar molecules, simple involves large polar molecules.

• Simple diffusion requires energy, facilitated does not.