Cell Membrane Function And Structure

Question 1

Isotonic

Answer 1

Concentration of solute is the same inside and outside of the cell

Question 2

Hypotonic

Answer 2

Solute concentration is higher INSIDE the cell than out.

Water moves inside the cell causing the cell to expand and possibly LYSE (burst)

Question 3

Hypertonic

Answer 3

Concentration of solute is higher OUTSIDE the cell than out.
Water moves out of the cell causing cell to shrivel

Question 4

Why will RBCs lyse in 0.3M solutions when its membrane is permeable to that solution

Answer 4

The solution would be higher inside since its membrane is permeable- causes the cell to lyse

Question 5

Partition coefficient

Answer 5

Measure of solubility of a solute molecule in oil relative to its solubility.
-Value close to 1=high solubility in oil, low solubility in water

Question 6

Polarity

Answer 6

The more polar a solute molecule is, more attracted it is to water.

Question 7

Why aren’t membranes permeable to sucrose?

Answer 7

Membrane is semi-permeable, sucrose is a bigger molecule and is not able to pass through the membrane

Question 8

Explain why a change in temperature might increase membrane permeability

Answer 8

As temperature increases, so does the fluidity of the membrane