Bio 11 – Zoology – Exercise 17 – The Plasma Membrane

How does a living cell like the amoeba remain intact in an aquatic medium?

Contractile vacuole

What similarities can you observe between the milk and the plasma membrane?

Both have regenerative abilities

Does removal of the skin remove any components from the milk preventing further skin formation?

No

How does the organization of a plasma membrane differ from that of the milk?

Milk is made up of proteins. Plasma membrane has a phospholipid bilayer

Does the dye dissolve and diffuse within the protein solution?

Yes

Is there any resemblance to the manner by which particulate material might pass from the outside into the cell’s interior? Explain.

Egg albumen and oil served the same function as the plasma membrane in the cell as a lipid-protein membrane allowing nigrosine to diffuse from a region of high concentration to low.

However, in a living cell, equilibrium is never attained. Explain this phenomenon.

Equilibrium is a steady state achieved when there are no further net movements of moleculesvia any process. Thus, it is only achieved when a cell is dead.

Compare results with those obtained in distilled water.

Distilled water – hemolysis – hypotonic solution

10% NaCl – crenation – hypertonic solution

0.9% NaCl – normal – isotonic solution

Note:

Can expound answer for sixth question by researching on polarity.