High Concentration vs Low Concentration

Movement of molecules from an area of high concentration to an area of low concentration is

• diffusion 
• passive transport
• osmosis
• all of the above

If a red blood cell is put in distilled water, what will most likely happen to the cell?

• Nothing will happen

• It will shrivel.

• It will burst and then shrivel up

• It will swell and burst

What does semi-permeable mean?

• Some molecules can move through the membrane

• Nothing can move through the membrane

• All molecules can pass through the membrane.

What is equilibrium?

• When concentrations cannot be balanced between two substances 
• When concentrations are balanced between two substances 
• Making the energy in the top half of your body equal the the energy in the bottom half
• Concentrations do not exist 

Which diagram best shows the end result of diffusion?

• F
• G
• H
• J

In a "high concentration," molecules

• are spread out

• are tightly packed together

• are uncrowded

• are unevenly dispersed

Which type of transport requires an input of energy?

• Passive Transport
• Osmosis
• Simple Diffusion
• Active Transport

Movement of molecules through the cell membrane from high to low concentration

• passive transport

• active transport

Active transport moves substances against a concentration gradient 

• true
• false 

An example of a substance that requires active transport to enter or leave a cell is

• protein

• water

• oxygen

• carbon dioxide