(a)[5]
Fig. 1.1 shows the digestive system diagram. Each letter can be used once, more than once or not at all. State the letter for the part in Fig. 1.1 that makes bile; that makes gastric juice; that makes urea; where maltose is digested; where trypsin acts.
(b(i))[4]
Explain the results for test-tubes B and C in Table 1.1.
(b(ii))[2]
Explain the purpose of test-tube A in Table 1.1.
(c)[2]
Complete the graph by drawing the line that shows the expected effect of temperature on lipase activity, and add a label line plus a label to mark the point where all the lipase has been denatured.
(d)[3]
Explain why lipase cannot be used to catalyse the breakdown of proteins.