Extra Membrane Permeability

Question 1

Solute

Answer 1

Substance dissolved in a solution

Question 2

Solvent

Answer 2

The liquid that dissolves the solute to form a solution

Question 3

Solution

Answer 3

Mixture of dissolved solute in a solvent

Question 4

Osmosis

Answer 4

Movement of water from low solute concentration to high solute concentration to achieve equilibrium

Question 5

Tonicity

Answer 5

The ability of a solution to make water move into or out of a cell by osmosis

Question 6

Hypotonic

Question 7

Isotonic

Answer 7

Equal solute concentration

RBCs are in an isotonic solution

Question 8

Hypertonic

Answer 8

Solution has a higher solute concentration

RBCs are in a hypertonic solution

Question 9

Why is 0.15 M NaCl isotonic with the 0.3M RBC cytoplasm?

Answer 9

NaCl dissociates into two parts: Na+ is 0.15 M and Cl- is 0.15 M so when you add them together, it equals 0.3 M and is equal to the RBC cytoplasm

Question 10

Can NaCl cross the cell membrane? Why?

Answer 10

No, NaCl is charged and needs a protein transporter to cross the membrane, something that is not available in the RBCs

Question 11

Why does 0.3 M Ethylene glycol cause lysis even though the solution is isotonic?

Answer 11

E. glycol wants to achieve equilibrium itself and over time will enter the cell

Question 12

Opaque solution is either

Answer 12

Isotonic of hypertonic (RBCs remained intact)

0.15 M or 0.8 NaCl

Question 13

More transparent solution is

Answer 13

Hypotonic

Water or 0.3 M Ethylene Glycol

Question 14

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