Cell Membrane, Passive and Active Transport

The difference in the concentration of a substance from one location to another is called a/an

• diffusion
• osmosis
• concentration gradient
• passive transport

A molecule that diffuses down a concentration gradient goes from an area of ______ concentration into an area of ______ concentration.

• high, low
• low, high
• passive, active
• active, passive

Passive transport requires no

• concentration gradients
• osmosis
• motion
• energy

This example of passive transport is the diffusion of water.

• osmosis
• concentration gradient
• isotonic
• facilitated diffusion

Controlling what goes into or out of the cell without energy is called

• active transport
• endocytosis
• passive transport
• exocytosis

This example of passive transport gets energy from the natural motion of particles

• osmosis
• concentration gradient
• isotonic
• diffusion

The higher the concentration of dissolved particles in a solution (solute), the _______ the concentration of water molecules in that solution. 

• higher
• greater
• lower
• smaller

This solution has the highest concentration of particles.

• hypertonic
• hypotonic
• isotonic

This solution has the highest concentration of water molecules.

• hypertonic
• hypotonic
• isotonic

This solution has the equal concentrations of water molecules and particles.

• hypertonic
• hypotonic
• isotonic