Cell Transport Review

Proteins built into the cell membrane which assist with the movement of materials are called:

• receptor proteins

• transport proteins

• marker proteins

• channel proteins

Diffusion is the movement of a substance

• through a lipid bilayer

• only in water

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

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

The diffusion of water through a permeable membrane is called

• facilitated diffusion

• active transport

• osmosis

• endocytosis

If the concentration of a sugar solution is lower outside the cell than inside the cell, which of the following will happen by osmosis?

• Water will move out of the cell

• Water will move into the cell

• Sugar will move out of the cell

• Sugar will move into the cell

A solution where the concentration of a sugar solution is lower outside the cell than inside the cell, is a ______________ solution.

• hypotonic

• hypertonic

• isotonic

• exotonic

How is the plasma membrane of a cell organized?

• one layer of phospholipids, through which proteins freely move

• one layer of phospholipids, which are laid out end-to-end, with a hydrophobic tail touching a hydrophilic head

• two layers of phospholipids, each of which has its hydrophilic side turned inward

• two layers of phospholipids, with their polar hydrophilic heads facing away from each other

The diagram below represents a cell in water. Explain why more water is moving out of the cell than into the cell.

• The concentration of solute in the cell is higher than it is outside the cell.

• The concentration of water outside the cell is too great.

• The concentration of water inside the cell is greater than it is outside the cell.

Which movement of substances through a cell membrane against a concentration gradient requires energy?

• osmosis

• diffusion

• active transport

• facilitated diffusion

The movement of molecules from a high concentration area to low concentration area.

• Diffusion

• Osmosis

• Active Transport

• Passive Transport

Diffusion of water molecules through selectively permeable membrane

• Diffusion

• Osmosis

• Active Transport

• Passive Transport