Cellular Transport Review

What does selective permeability means?

• The movement of materials through (or across) the cell membrane

• The movement of molecules from an area of high concentration to a area of low concentration

• The movement of materials across the cell membrane that requires NO ENERGY from the cell.

• The ability of the cell membrane to allow some things to pass through while preventing other things from passing through

The movement of water through a semi-permeable membrane from a region of high concentration to a region of low concentration, tending to equalize the concentrations of the water.

• Osmosis

• Active Transport

• Diffusion

• Tonicity

A solution that has a higher solute concentration than another solution wherein water particles will move out of the cell will cause ____________

• Lysis

• Swelling

• Crenation

A solution that has a lower solute concentration than another solution wherein water particles will move into the cell will cause the cell to ______ and eventually ________

• shrink; crenate

• shrink;lyse

• swell; lyse

• swell; shrivel

Which transport mechanism can bring whole cells into a cell?

• pinocytosis
• phagocytosis
• facilitated transport
• primary active transport

In what important way does receptor-mediated endocytosis differ from phagocytosis?

• It transports only small amounts of fluid.
• It does not involve the pinching off of membrane.
• It brings in only a specifically targeted substance.
• It brings substances into the cell, while phagocytosis removes substances.

What problem is faced by organisms that live in fresh water?

• Their bodies tend to take in too much water.
• They have no way of controlling their tonicity.
• Only salt water poses problems for animals that live in it.
• Their bodies tend to lose too much water to their environment.

The principal force driving movement in diffusion is the __________.

• temperature
• particle size
• concentration gradient
• membrane surface area

Water moves via osmosis _________.

• throughout the cytoplasm
• from an area with a high concentration of other solutes to a lower one
• from an area with a high concentration of water to one of lower concentration
• from an area with a low concentration of water to one of higher concentration

What happens to the membrane of a vesicle after exocytosis?

• It leaves the cell.
• It is disassembled by the cell.
• It fuses with and becomes part of the plasma membrane.
• It is used again in another exocytosis event.