Pretest-M.P. 1-Osmosis,Diffusion, Active Transport,Tonicity

Both side of a selectively- permeable membrane are equal. The sides are ______.

• isotonic
• hypertonic
• hypotonic

Osmosis is the diffusion of _____ across a selectively permeable membrane.

• food
• air
• water
• oxygen

During diffusion

• substances (things) moves from high to low concentration
• water moves when energy is used
• large or oddly shaped molecules move across a cell membrane
• water moves from high to low concentration

The picture  is an example of _________________.

• isotonic
• diffusion
• osmosis
• active transport

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

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

In facilitated diffusion, molecules move

• Down a concentration gradient
• Against a concentration gradient