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.
During diffusion, molecules diffuse from a region where their concentration is low to a region where their concentration is higher until they are evenly dispersed.
A cell placed in a strong salt solution would probably burst because of an increase in osmotic pressure.
When the concentration of solutes outside the cell is equal to the concentration of solutes inside the cell, the cell solution is isotonic relative to its environment.
Diffusion occurs only in living systems.
The transport of specific particles through a membrane by carrier proteins is known as facilitated diffusion.
Ion channels are usually able to transport only one type of ion.
Facilitated diffusion moves molecules and ions in one direction only, while active transport moves them in two directions.
In active transport, energy is required to move a substance across a cell membrane.
Both the sodium-potassium pump and the proton pump require energy to move particles across the cell membrane.
The sodium-potassium pump moves sodium and potassium ions against the concentration gradient.
Exocytosis helps the cell rid itself of wastes.
During the process of exocytosis, the cell membrane extends to engulf substances that are too big to pass through the cell membrane.
Complete each sentence or statement.
Active transport systems are a form of cell transport that requires energy from molecules of ____________________.
____________________ allows a cell to stockpile substances in far greater concentrations than they occur outside the cell.
The transport of food into cells involves the action of the sodium-potassium pump and ____________________ channels.
Refer to the illustration above. The process shown in figure “B” is called ____________________.
Refer to the illustration above. Cells often trap extracellular particles and fluid. This is shown in figure ____________________.
The process in which an amoeba engulfs its prey and takes it in is known as ____________________.