Exploring Passive Transport Mechanisms

The video tutorial covers cellular transport, focusing on passive transport. It explains the concept of concentration gradients and how molecules move from high to low concentration without energy. The tutorial discusses equilibrium, dynamic equilibrium, and types of passive transport, including diffusion, facilitated diffusion, and osmosis. Examples illustrate how water movement affects cell size.

What is a concentration gradient?

• The movement of molecules from low to high concentration

• The process of molecules moving against the concentration gradient

• The equal distribution of molecules on both sides of the membrane

• A difference in the concentration of molecules across a cell membrane

In passive transport, molecules move from an area of:

• Low concentration to high concentration

• High concentration to low concentration

• Equal concentration to unequal concentration

• Low energy to high energy

Which of the following statements is true about passive transport?

• It requires energy to move molecules

• It only occurs in plant cells

• It does not require energy

• Molecules move against the concentration gradient

What is the main difference between diffusion and facilitated diffusion?

• Diffusion requires energy, while facilitated diffusion does not

• Facilitated diffusion requires a transport protein, while diffusion does not

• Facilitated diffusion occurs only in animal cells

• Diffusion moves molecules from low to high concentration, while facilitated diffusion moves them from high to low

What is osmosis?

• The movement of water from low to high concentration

• The movement of water from high to low concentration

• The movement of solutes from high to low concentration

• The movement of solutes from low to high concentration

In osmosis, water moves from an area of:

• Low solute concentration to high solute concentration

• High solute concentration to low solute concentration

• Equal solute concentration to unequal solute concentration

• Low water concentration to high water concentration

What happens to a cell placed in 100% pure water?

• The cell becomes bigger

• The cell shrinks

• The cell stays the same size

• The cell dissolves

What is dynamic equilibrium?

• When molecules stop moving

• When molecules move from low to high concentration

• When molecules move from high to low concentration

• When molecules move at an equal rate in both directions

What happens to a cell when the water concentration is equal inside and outside?

• The cell stays the same size

• The cell shrinks

• The cell swells

• The cell bursts

What is the term for the constant movement of molecules?

• Facilitated diffusion

• Brownian motion

• Dynamic equilibrium

• Static equilibrium