(a(i))[1]
State one role of a nucleus.
(a(ii))[2]
State the names of structures P and R in Fig. 6.1.
(b)[7]
Complete the sentences with the most suitable words. Enzymes are made of protein and act as [BLANK] because they speed up chemical reactions without being changed in them. Amylase speeds up the breakdown of [BLANK] into [BLANK]. Trypsin continues the chemical digestion of protein started by the enzyme [BLANK] in the stomach. The optimum pH for pancreatic enzymes is above pH 7. Bile is made by the [BLANK] and enters the small intestine, where it [BLANK] stomach acid to provide the correct pH. Bile also breaks down fat by [BLANK] to increase the surface area for lipase to act on.