passive transport

When the number of water molecules outside of the cell is greater than inside the cell, which will most likely occur?

• Molecules of water will NOT MOVE either way.

• Molecules of water will move OUT of the cell.

• Molecules of water will move INTO the cell.

• Molecules of water will EVAPORATE.

Cell membranes are described as selectively permeable.

Four students were asked to explain what this means. Which one is correct?

• Student 1: Cell membranes prevent all materials from entering the cell.

• Student 2: Cell membranes only provide structural support for the cell.

• Student 3: Cell membranes regulate which substances can enter and exit the cell.

• Student 4: Cell membranes allow water and water-soluble substances to enter the cell.

The processes of diffusion AND active transport are both used to...

• break down molecules to release energy

• move molecules into or out of cells of the body

• bring molecules into cells ONLY when they are more concentrated outside of the cell

• move molecules ONLY against a concentration gradient, using ATP molecules

Equilibrium?

• a large  amount of substance on  side of the cell and a small amount on the other side
• a small  amount of substance on  side of the cell and a large amount on the otherside
• equal amount of substance on either side of the membrane  
• no particles on either side of the a cell membrane

Diffusion can be used in...

• Plants and Animals
• Only Plants
• Only Animals
• Only Humans

Passive Transport means

• Energy is used

• No energy is used

• Energy is created

Passive transport moves molecules from...

• low concentration to high concentration

• high concentration to low concentration

Which type of Passive transport uses the help of a transport protein?

• Osmosis

• Facilitated diffusion

• Simple diffusion

Where is there a low concentration of dye?

• at the bottom of cup
• in the color
• at the top of cup 
• no concentration gradient

What is diffusion?

• when molecules move 
• when molecules move from a high concentration to a low.
• no movement 
• molecules move everywhere