Facilitated Diffusion

What is the process called when molecules move from a region of high concentration to a region of low concentration?

• Osmosis

• Active transport

• Diffusion

• Filtration

What characteristic of the cell membrane determines its selective permeability?

• Its thickness

• Its color

• Its permeability to certain molecules based on size and polarity

• Its electrical charge

What does the term 'semi-permeable' mean in the context of the cell membrane?

• It changes permeability based on the weather

• It only allows certain substances to pass through

• It prevents any substances from passing through

• It allows all substances to pass through

Why can oxygen molecules pass through the cell membrane easily?

• They are blocked by the membrane

• They are large and polar

• They are small and non-polar

• They require energy to pass through

Why can't sugar molecules pass directly through the phospholipid bilayer of the cell membrane?

• They dissolve in the lipid bilayer

• They are gaseous at room temperature

• They are small and non-polar

• They are large and polar

What role do proteins play in facilitated diffusion?

• They provide energy for transport

• They act as channels for specific molecules

• They block unwanted molecules

• They break down substances before transport

What is facilitated diffusion?

• Movement of water through a semi-permeable membrane

• Use of cellular energy to move molecules

• Passive transport of substances through specific proteins

• Active transport of ions against the concentration gradient

How does the cell solve the problem of transporting substances that cannot pass through the bilayer directly?

• By removing the bilayer

• By using facilitated diffusion

• By increasing the temperature

• By decreasing the membrane's permeability

Which statement is true about the movement of substances in facilitated diffusion?

• It is an active process

• It requires ATP

• It moves substances from high to low concentration

• It moves substances from low to high concentration

What does the specificity of transport proteins in facilitated diffusion imply?

• All proteins transport glucose

• Proteins randomly transport substances

• Each protein is specific to a particular substance

• Any protein can transport any substance