Ch 5 Membranes

Question 1

Osmosis

Answer 1

The diffusion of water across a selectively permeable membrane from an area of lower concentration to an area of higher concentration. Does not use energy

Question 2

How does water diffuse across a membrane?

Answer 2

From an area of lower solute to an area of higher solute.

Question 3

Tonicity

Answer 3

The ability of a surrounding solution to cause a cell to gain or lose water

Question 4

Isotonic Solution

Answer 4

Solute concentration is the same as that inside the cell

Question 5

Hypertonic solution

Answer 5

Solute concentration is greater than that inside the cell

Question 6

Hypotonic solution

Answer 6

Solute concentration is less than that inside the cell

Question 7

Plasmolysis

Answer 7

When in a hypertonic environment plant cells lose water causing the membrane to pull away from the wall

Question 8

Osmoregulation

Answer 8

The control of solute concentrations and water balance

Question 9

Facilitated diffusion

Answer 9

Transport proteins speed the passive movement of molecules across the plasma membrane

Question 10

Active transport

Answer 10

Moves substances against their concentration gradients. Uses energy