Assume that glucose is transported across a membrane at 3 × 10–10 mol/(cm2·s). a

Question

Assume that glucose is transported across a membrane at 3 × 10–10 mol/(cm2·s).

a) When the ratio of the concentration of glucose in the blood to the concentration of glucose in the cell is halved, what is the effect on the net rate of glucose transport into the cell?

a. The new rate is about 1.5 × 10^-10 mol/(cm^2·s).
b. The new rate is about 3 × 10^–10 mol/(cm^2·s).
c.The new rate is about 1.7 × 10^-5 mol/(cm^2·s).
d. The new rate is about 6 × 10^-10 mol/(cm^2·s).

b) What would be the effect on the net rate of transport for a synthetic membrane that is 15% thinner? (The ratio of the concentration of glucose outside to the concentration of glucose inside remains the same.)

a. The net rate will increase.
b. The net rate will decrease.
c. The net rate will remain the same.


hint:

J=[-KD1 (C2-C1)]/l


where J is the net rate of transport K is the partition coefficient
D1 is the diffusion coefficient in cm2/s
C2–C1 is the concentration difference across the membrane
l is the thickness of the membrane in cm

Explanation / Answer

Part A: The new rate is about 1.5 10^-10 mol/(cm^2s).

Part B: The net rate will increase.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---