7.3 Cell Transport

Front

The movement of materials across the cell membrane without using cellular energy is called _______________. Options: active transport, sodium-potassium pump, passive transport, endocytosis

Back

passive transport

Front

One of the most important functions of the cell membrane is to keep the cell’s internal conditions relatively constant. It does this by:

Back

regulating the movement of molecules from one side of the membrane to the other side

Front

The cytoplasm of a cell is a solution of many different substances dissolved in water.

Back

True

Front

If the substance can cross the cell membrane, its particles will tend to move toward the area where it is less concentrated until it is evenly distributed. This is called: osmosis, diffusion, active transport, facilitated diffusion

Back

diffusion

Front

When the concentration of the substance on both sides of the cell membrane is the same, ____________ is reached.

Back

equilibrium

Front

Even when equilibrium is reached, particles of a solution will continue to move across the membrane in both directions.

Back

True

Front

Diffusion depends upon______________.

Back

random particle movements

Front

Cell membranes have _________ that act as carriers, or channels, making it easy for certain molecules to cross.

Back

proteins

Front

Molecules that cannot directly diffuse across the membrane pass through special protein channels in a process known as _______________.

Back

facilitated diffusion

Front

The inside of a cell’s lipid bilayer is hydrophobic—or “water-hating.” Because of this, water molecules have an easy time passing through the cell membrane.

Back

False