Blood contains white blood cells and red blood cells.

1. (a)(i)Fig. 3.1 is a photomicrograph showing different types of blood cell. Identify cell X and cell Y in Fig. 3.1. X Y[2]
2. (a)(ii)The width of one of the cells in Fig. 3.1 is represented by the line Z. The actual width of cell Z is 8 µm. Calculate the magnification used to produce the image shown in Fig. 3.1. Write down the formula you will use to make your calculation. formula magnification = x[2]
3. (b)(i)Carbonic anhydrase is an enzyme found in red blood cells. Describe how carbonic anhydrase is involved in the release of oxygen from red blood cells at respiring tissues.[4]
4. (b)(ii)Sulfonamide is a competitive inhibitor of carbonic anhydrase. Fig. 3.2 shows the effect of increasing substrate concentration on the rate of the reaction catalysed by carbonic anhydrase. Sketch a curve on Fig. 3.2 to show the effect of sulfonamide on the rate of reaction catalysed by carbonic anhydrase.[2]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.