membrane function

_____ is to eating as ______ is to drinking.

Phagocytosis . . . pinocytosis

A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is true?

The solution in the balloon is hypertonic relative to the solution in the beaker.

Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?

active transport

Active transport ______.

can move solutes against their concentration gradient uses ATP as an energy source can involve the transport of ions requires the cell to expend energy

When two solutions that differ in solute concentration are placed on either side of a selectively permeable membrane, and osmosis is allowed to take place, the water will ______.

exhibit a net movement to the side with lower water concentration

Cells with a higher concentration of ions than the surrounding medium tend to ______.

expand

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell. The presence of these organelles tells you that the environment ______.

is hypotonic to the protozoan

A cell that neither gains nor loses water when it is immersed in a solution is ______.

isotonic to its environment

Diffusion is an example of ______.

passive transport

The act of a white blood cell engulfing a bacterium is ______.

phagocytosis

Diffusion ______.

proceeds until equilibrium is reached

Osmosis can be defined as ______.

the diffusion of water

Facilitated diffusion across a biological membrane requires ______ and moves a substance ______ its concentration gradient.

transport proteins . . . down