Transport and Membrane

Question 1

Give examples for a simple diffusion

Answer 1

O2, CO2, lipid based molecules such as steroids

Question 2

Give examples for facilitated diffusion (DE: erleichterte Diffusion) using channel proteins (DE: Kanalprotein)

Answer 2

Na+, Ca++

Question 3

Give examples for diffusion using carrier proteins (DE: Carrier-Protein)

Answer 3

larger molecules like glucose and amino acids

Question 4

Give examples for bulk transport (endocytosis/ exocytosis)

Answer 4

hormones, white blood cells engulfing microorganism

Question 5

What does kiloPascal (kPa) stand for?

Answer 5

water potential

Question 6

What does 0 kPa mean?

Answer 6

• 0 kPa: is the highest water potential (pure water)
• kPa: the more the negative the more particles are in water

Question 7

When does an animal cell burst?

Answer 7

An animal cell bursts when it is put into a solution with high water potential because water molecules will diffuse (DE: diffundieren) into the cell.

Question 8

What happens when a plant cell is put into water with high water potential?

Answer 8

The cell membrane pushed against the call wall and the cell becomes turgid.

Question 9

When does an animal cell shrink?

Answer 9

When an animal cell is put into a solution with very negative water potential it shrinks. Water molecules diffuse from the cell into the solution.

Question 10

What happens if a plant cell is put into a solution with negative water potential?

Answer 10

The plant cell membrane pulls away from the cell wall as water diffuses from the cell into the solution. The plant cell is plasmolysed (DE: Plasmolyse).