Cellular Transport Quiz24f

Which of the following structures serves as the cell’s boundary from its environment? - thin, flexible barrier around a cell; regulates what enters and leaves the cell

• mitochondrion
• cell membrane
• chloroplast
• channel proteins

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
• d. all of the above

When the concentration of molecules on both sides of a membrane are the same, the solutions are _____________.

• hypotonic
• hypertonic
• isotonic
• saturated

When comparing two solutions, the solution with the greater concentration of solutes(less water) is called __________________________.

• hypotonic
• hypertonic
• isotonic
• saturated

Diffusion occurs because

• molecules constantly move and collide with each other.
• the concentration of a solution is never the same throughout a solution.
• the concentration of a solution is always the same throughout a solution.
• molecules never move or collide with each other.

The diffusion of water across a selectively permeable membrane is called

• phagocytosis
• osmosis
• facilitated diffusion
• active transport

What will happen when an animal cell was put into fresh water (hypotonic solution).

• water will move into the cell (swell/burst).
• water will move out of the cell (shrink).
• solutes will move into the cell.
• solutes will move out of the cell

The movement of specific molecules across cell membranes through a protein channel that go from high concentration to low and do not require energy is called ______________________________.

• Active transport
• Osmosis
• Facilitated transport
• Endocytosis

An animal cell was placed in a solution and was observed to have shrunk in size and shriveled up. What can be inferred about the solution?

• The solution is isotonic
• The solution is hypotonic
• The solution is hypertonic
• The solution has more water than the cell.

When a drop of food dye is placed in a flask of water, the dye molecules spread slowly through the entire volume of the water until they are evenly distributed. Name this type of transport.

• a. diffusion
• b. osmosis
• c. molecular pumps
• d. facilitated diffusion