Passive Transport Review

The diagram shows the process of osmosis. Only the water molecules could exit the cell because water molecules

• Have more energy than the protein molecules

• Are larger than the protein molecules

• the semipermeable membrane allows water out but does not allow protein in.

• Contain more hydrogen atoms than the protein molecules

The diffusion of water across a selectively permeable membrane is called

• Active transport

• Osmosis

• Passive transport

• Facilitated diffusion

Diffusion is the movement of molecules from

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

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

• An area of equilibrium to an area of high concentration

• No movement of molecules

The process illustrated in the drawing is called

• Osmosis

• Active transport

• Exocytosis

• Diffusion

The picture diagrams which of the following processes?

• Simple diffusion

• Active transport

• Osmosis

The cell in the picture above is in which type of solution? (Hint: The picture shows lots of water on the outside of the cell and only a little bit of water on the inside of the cell)

• Hypertonic

• Hypotonic

• Isotonic

The cell membrane is composed of 2 layers of

• Phospholipids

• Proteins

• Carbohydrates

• Fluorocarbons

When there is a lower concentration of water outside of a cell than inside of the cell, what will happen?

• Water will enter the cell and cause the cell to get larger

• Water will enter the cell and cause the cell to get smaller

• Water will exit the cell and cause the cell to get larger

• Water will exit the cell and cause the cell to get smaller

Phospholipid molecules in a membrane are arranged with their __________ on the outside and their _________ on the inside.

• Hydrophobic heads; hydrophilic tails

• Hydrophilic heads; hydrophobic tails

• Hydrophobic tails; hydrophilic heads

• Hydrophilic tails; hydrophobic heads

The key feature of all forms of passive transport is that they do not require

• Water

• Cells

• Sugar

• Energy (ATP)