Question

1. Which of the following statements is FALSE? Select one:

a. 0.5M NaCl is hypertonic to the red blood cells while 0.5M Urea is hypotonic to the cells.

b. After the blood is added, a solution made of 0.3M NaCl + 0.3M Urea is hyperosmotic the red blood cells while a solution made of 0.3M cholesterol + 0.3M liposomes is hypoosmotic to the cells.

c. A solution made of 0.3M Glucose + 0.3M NaCl is hyperosmotic to the red blood cells before and after the blood is added.

d. 1M NaCl is hyperosmotic to 1M Glucose while 2M Glucose is isoosmotic to 2M Urea. e. Plasma is isoosmotic to 0.3M NaCl.

2.

A drop of blood is added into a solution and found that red blood cells will hemolyse. What solution(s) might it be, given that the membrane is not permeable to glucose but permeable to water? Select one or more:

a. 0.1M Glucose

b. 0.2M Glucose

c. 0.3M Glucose

d. 0.4M Glucose

e. 0.5M Glucose

3. What is TRUE about Na⁺-K⁺ ATPase?

Select one or more:

a. Na⁺-K⁺ ATPase pumps 3Na⁺ ions from the extracellular fluid (ECF) to intracellular fluid (ICF).

b. Na⁺-K⁺ ATPase pumps 2K⁺ions from ICF to ECF.

c. Na⁺-K⁺ ATPase is phosphorylated when facing the ECF.

d. Na⁺-K⁺ ATPase is dephosphorylated when facing the ICF.

e. Na⁺-K⁺ ATPase has a higher affinity for 3 Na⁺ ions when the carrier is facing the ECF.

f. Na⁺-K⁺ ATPase has a higher affinity for 2K⁺ ions when it is facing the ICF

Answer 1