Exploring Cellular Transport Mechanisms

What is the primary characteristic of passive transport?

• It involves the use of ATP.

• It does not require energy.

• It moves molecules from low to high concentration.

• It requires energy.

In diffusion, molecules move from an area of _______ concentration to an area of _______ concentration.

• equal; unequal

• low; high

• high; low

• unequal; equal

What is a concentration gradient?

• The movement of molecules against their concentration.

• The equilibrium state of molecules.

• The difference in concentration of molecules across a space.

• A measure of the amount of energy required for transport.

Which of the following is true about facilitated diffusion?

• It involves the assistance of membrane proteins.

• It requires energy.

• It is a type of active transport.

• It moves molecules against their concentration gradient.

What role do membrane proteins play in facilitated diffusion?

• They assist in moving molecules across the membrane.

• They create a concentration gradient.

• They provide energy for the process.

• They stop the diffusion process.

Which factor does NOT affect the rate of diffusion?

• Concentration gradient

• Distance molecules must travel

• Color of the molecules

• Surface area of the membrane

Osmosis specifically refers to the movement of which substance?

• Glucose

• Carbon dioxide

• Oxygen

• Water

What is the main difference between osmosis and diffusion?

• Osmosis moves molecules from high to low concentration, diffusion does the opposite.

• Osmosis involves water, diffusion involves other molecules.

• Osmosis uses membrane proteins, diffusion does not.

• Osmosis requires energy, diffusion does not.

Active transport moves molecules from _______ concentration to _______ concentration.

• low; high

• equal; unequal

• unequal; equal

• high; low

What is required for active transport to occur?

• ATP

• No energy

• Facilitated diffusion

• Osmosis