3.4 Diffusion And Osmosis

Question 0

is the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration

Answer 0

Diffusion

Question 1

is the move- ment of molecules across a cell membrane without energy input from the cell. It may also be described as the diffusion of molecules across a membrane.

Answer 1

Passive transport

Question 2

is the difference in the concentration of a substance from one location to another

Answer 2

Concentration gradient

Question 3

Water molecules, of course, also diffuse. They move across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration. This process is called

Answer 3

Osmosis

Question 4

to a cell if it has the same concentration of dis- solved particles as the cell. Water molecules move into and out of the cell at an equal rate, so the cell’s size remains constant.

Answer 4

Isotonic

Question 5

solution has a higher concentration of dissolved particles than a cell.

Answer 5

Hypertonic

Question 6

solution has a lower concentration of dissolved particles than a cell.

Answer 6

Hypotonic

Question 7

is the diffusion of molecules across a membrane through transport proteins

Answer 7

Facilitated diffusion