Indicate whether the sentence or statement is true or false.
Diffusion is an active process that requires a cell to expend a great deal of energy.
A concentration gradient is the difference in concentrations of a substance across space.
A solution outside a cell is hypotonic if its concentration of solute molecules is lower than the
concentration of the solute molecules inside the cell.
Homeostasis is the process by which molecules move toward an area of lesser concentration.
Facilitated diffusion is an active form of carrier transport.
The sodium-potassium pump moves sodium ions into the cell and potassium ions out of the cell.
Wastes may exit a cell by pinocytosis.
Ion channels are usually able to transport only one type of ion.
Identify the letter of the choice that best completes the statement or answers the question.
A cell membrane consists of phospholipids and different large molecules of
The outer surface of a cell membrane is:
Which of the following is an example of osmosis?
Pinocytosis and phagocytosis are both examples of:
Some plants absorb mineral ions from the soil even though the soil concentration is lower than the internal cell concentration. This is due to:
The pouch formed during endocytosis is called a:
A process that requires the addition of energy is
If two substances of different concentrations are present on either side of a semipermeable membrane, the substances move
The following are steps that occur during endocytosis. Which is the first step that is out of order.
Na+ ions are transported across cell membranes of body cells by
The process by which molecules of a substance move from an area of higher concentration of that substance to an area of lower concentration is known as
Concentration of Water and Solutes in Four Adjacent Cells
Refer to the illustration above. In this system, solute molecules in cell “B” are most likely to
Refer to the illustration above. In this system, water molecules are most likely to diffuse in which direction?
The dispersal of ink in a beaker of water is an example of
Which of the following enters a cell by active transport?
endocytosis : exocytosis ::
Glucose enters a cell most rapidly by
When the cells in a plant have low turgor pressure, the plant