May/June 2026 Paper 63

2026 · 3 questions · 18 parts · 40 marks

0/40 marks

0Correct0Partial0Wrong18Unattempted

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Finish set

1(a)(i)1(a)(ii)1(a)(iii)1(a)(iv)1(a)(v)1(a)(vi)1(a)(vii)1(a)(viii)1(b)

–/15 mks

2(a)(i)2(a)(ii)2(b)(i)2(b)(ii)

–/14 mks

3(a)(i)3(a)(ii)3(a)(iii)3(b)(i)3(b)(ii)

–/11 mks

Context for 2(a)

Figure 2.1 is a photomicrograph of the smallest bone in the human body.

Figure 2.1, a photomicrograph of the stapes bone, magnification ×43, with a line AB drawn beneath it across its width

2(a)(i)Medium4 marks

Draw a large diagram of the bone shown in Figure 2.1.

Draw with the mouse or a finger.

2(a)(ii)Medium3 marks

Line AB represents the width of the bone. Measure the length of line AB in Figure 2.1. Calculate the actual width of the bone, using the formula and your measurement.

magnification = \frac{length of line AB in Figure 2.1}{actual width of the bone}

Give your answer to two significant figures.

length of line AB

actual width of the bone

2(b)(i)Hard6 marks

Milk is a liquid food that contains fat. The enzyme lipase catalyses the breakdown of the fat in milk into fatty acids and glycerol. As the concentration of fatty acids increases, the pH of the milk decreases. Plan an investigation to determine how temperature affects the activity of lipase.

Your answer

2(b)(ii)Easy1 mark

Milk also contains protein. State the name of the solution needed to test for protein.