Cell Transport Mechanisms and Processes

This video reviews the mechanisms of transport, including diffusion, facilitated diffusion, osmosis, and active transport. It explains how molecules move across cell membranes, the role of proteins in facilitated diffusion, and the energy requirements of active transport. The video also covers large molecule transport through endocytosis and exocytosis.

What is the primary characteristic of diffusion?

• Movement from low to high concentration

• Movement from high to low concentration

• Requires energy

• Involves large molecules

Which type of molecules can freely move across the cell membrane?

• Ions

• Large polar molecules

• Small nonpolar molecules

• Proteins

What is facilitated diffusion?

• Movement of molecules through a protein

• Movement of ions only

• Movement of molecules with energy

• Movement of water only

What role do aquaporins play in osmosis?

• Block water movement

• Require energy

• Facilitate water movement

• Transport ions

In an isotonic solution, what is the concentration of solute on both sides of the membrane?

• Higher on one side

• Lower on one side

• Equal on both sides

• No solute present

What is required for active transport to occur?

• No energy

• ATP

• Osmosis

• Diffusion

What is the function of protein pumps in active transport?

• Move molecules with the gradient

• Facilitate diffusion

• Move molecules against the gradient

• Transport water only

What is endocytosis?

• Movement of water across a membrane

• Release of substances from a cell

• Facilitated diffusion of ions

• Intake of large particles into a cell

What is the difference between phagocytosis and pinocytosis?

• Phagocytosis involves solids, pinocytosis involves liquids

• Phagocytosis involves liquids, pinocytosis involves solids

• Both require no energy

• Both involve only gases

What is exocytosis?

• Intake of substances into a cell

• Facilitated diffusion of water

• Release of substances from a cell

• Movement of ions across a membrane