Lipase is an enzyme found in the human digestive system. Complete the word equation to show the substrate and products for a reaction catalysed by lipase.

\to

fatty acids

+

6(b)(i)Enzymes Enzyme KineticsHard4 marks

There are different types of lipase. Figure 6.1 shows the effect of pH on the enzyme activity of two types of lipase, type P and type Q.

Figure 6.1, a plotted graph of enzyme activity / arbitrary units (0 to 14) against pH (3 to 12), with a key: type P lipase (solid line) is 0 at pH 3, 1 at pH 4, 8 at pH 5, peaks at 14 at pH 6, then 9 at pH 7, 2 at pH 8, 1 at pH 9 and 0 from pH 10 to 12; type Q lipase (dashed line) is 0 at pH 3 and 4, just above 0 at pH 5, 1 at pH 6, 4 at pH 7, peaks at 10 at pH 8, then 6 at pH 9, 4 at pH 10, 2 at pH 11 and 0 at pH 12

Describe two similarities and two differences between the effect of pH on the enzyme activity of type P lipase and type Q lipase. similarity 1 similarity 2 difference 1 difference 2

Answer

0 words

6(b)(ii)Tables GraphsEasy1 mark

Using Figure 6.1, identify the pH values where type Q lipase has 50% of its maximum activity.

Two answers required.

6(b)(iii)Enzymes Enzyme KineticsMedium3 marks

Explain the effect of pH on the enzyme activity of type P lipase shown in Figure 6.1.

Answer

0 words

6(c)(i)Human Nutrition DigestionEasy1 mark

In the small intestine, bile provides a suitable pH for type Q lipase. State one other function of bile.

6(c)(ii)Human Nutrition DigestionEasy1 mark

State the name of the organ that produces bile.