Osmosis

Which best describes which directions molecules move during diffusion?

• from an area of equilibrium to an area of high concentration

• from an area of equilibrium to an area of low concentration

• from an area of low concentration to an area of high concentration

• from an area of high concentration to an area of low concentration

What is the process by which water diffuses across a selectively permeable membrane?

• active  transport

• osmosis

• simple diffusion

• facilitated diffusion

You decide to buy a new fish for your freshwater aquarium. When you introduce the fish into its new tank, the fish swells up and dies. You later learn that it was a fish from the ocean. what could have caused the fish to swell up and die?

• The water from the cells of the fish began to move out causing the cells to shrink.

• The salt moved into cells causing the fish to die.

• The freshwater from the aquarium moved into cells of the fish.

• The different concentrations of salt and freshwater caused the fish to be in an isotonic state.

In which osmotic state does the cell shrink?

• hypertonic

• isotonic

• hypotonic

In which osmotic state does the cell look normal?

• hypertonic

• isotonic

• hypotonic

During which osmotic state does the cell swell and get bigger?

• Hypertonic

• Isotonic

• Hypotonic

Which statement best describes the cell membrane?

• The protective outer layer that controls what enters and leaves the cell.
  
• Stores information on DNA molecules / Directs and controls the activities of the cell.
  
• A folded membrane that moves materials around inside cells / Also acts as the site of manufacturing materials needed by the cell.
  
• The smallest organelle with a huge job / Makes proteins, which are the building blocks of the body.
  

Osmosis is the movement of _____ across a membrane.

• food
• energy
• oxygen
• water

Why can't you drink salt water?

• It's hypertonic to your cells

• It's hypotonic to your cells

• It's isotonic to your cells

• It's paratonic to your cells

This egg has shrunk (gotten smaller), what type of solution was it placed in?

• hypotonic solution

• hypertonic solution

• isotonic solution

• active transport