Simple Diffusion

Question 1

characteristics

Answer 1

• movement down concentration gradient
• no energy require / passive transport
• no assistance required (no transmembrane protein)

Question 2

examples

Answer 2

oxygen, CO2, water , ethanol

Question 3

osmosis

Answer 3

simple diffusion of water: net movement of water molecules from a region of high water potential (dilute solution) to a region of lower water potential (concentration solution) through a partially permeable membrane

Question 4

osmosis of animal cell

Answer 4

• in a solution with a lower water potential than the cell, water will leave the cell and will shrink (hypertonic)
• in a solution with a higher water potential than the cell, the cell will intake water until its membrane stretches too much and bursts (hypotonic)
• for no net movement of water, cell needs to be in an isotonic solution

Question 5

hypotonic solution

Answer 5

high concentration of water molecules and low concentration of salt/sugar

Question 6

hypertonic solution

Answer 6

low concentration of water molecules and high concentration of salt/sugar

Question 7

isotonic solution

Answer 7

same concentration of water molecules and salt/sugar

Question 8

Plant cell state in osmosis

Answer 8

• hypertonic: plasmolysed
• hypotonic: turgid
• isotonic: flaccid