(a(i))[2]
Identify cell X and cell Y shown in Fig. 3.1.
(a(ii))[2]
In Fig. 3.1, the line Z shows the width of one cell. The true width of cell Z is $8\,\mu\text{m}$. Calculate the magnification used to make the image in Fig. 3.1. State the formula you will use for the calculation.
(b(i))[4]
Carbonic anhydrase is an enzyme located in red blood cells. Describe how carbonic anhydrase helps oxygen be released from red blood cells at respiring tissues.
(b(ii))[2]
Sulfonamide is a competitive inhibitor of carbonic anhydrase. Fig. 3.2 shows how increasing substrate concentration affects the rate of the reaction catalysed by carbonic anhydrase. Sketch a curve on Fig. 3.2 to illustrate the effect of sulfonamide on the rate of reaction catalysed by carbonic anhydrase.