Exercise 3: Transport and the Plasma Membrane

Question 1

It refers to the passive movement of particles from a region of high concentration to a region of low concentration.

Answer 1

diffusion

Question 2

It refers to the movement of water from a region of low solute concentration (high free water concentration) to a region of high solute concentration (low free water concentration) across a semipermeable membrane.

Answer 2

osmosis

Question 3

Which organelle refers to the semipermeable membrane that separates the cytosol from the external environment?

Answer 3

plasma membrane

Question 4

TRUE or FALSE:
The plasma membrane consists of a lipid bilayer that allows passive diffusion on non-polar compounds.

Answer 4

True

Question 5

Give the 3 properties of the plasma membrane.

Answer 5

• self-healing or self-regenerative ability
• semi-permeability
• fluidity

Question 6

TRUE or FALSE:
Some proteins in the plasma membrane facilitate the transport of ions and polar molecules.

Answer 6

True

Question 7

In the plasma membrane set-up, what does the water, oil, and alcohol represent?

Answer 7

• water - intracellular environment
• oil - plasma membrane
• alcohol - extracellular environment

Question 8

TRUE or FALSE:
Heat increases the fluidity of plasma membrane, affecting its permeability as well.

Answer 8

True

Question 9

It refers to the pigment giving off purple colorations.

Answer 9

anthocyanin

Question 10

It refers to the process in which the protoplast shrinks and occupies lesser volume compared to the cell wall.

Answer 10

plasmolysis

Question 11

Which type of solution is formed when 10% NaCl mixes with red blood cells?

Answer 11

hypertonic solution

Question 12

Which type of solution is formed when distilled water mixes with red blood cells?

Answer 12

hypotonic solution

Question 13

Which type of solution is formed when 9% NaCl mixes with red blood cells?

Answer 13

isotonic solution