O-LevelBiologyHuman Nutrition5090/21 · May/June 2016 · Q310 Marks
Digestion in the human alimentary canal is carried out by the action of enzymes. Each food group is the substrate for a specific enzyme. [Figure 3.1]
- (a)Fig. 3.1 shows diagrams that each represent the action of a specific enzyme to break down a substrate into one or more end products. Diagram F in Fig. 3.1 has been completed for you. Complete diagrams G and H in Fig. 3.1.[6]
- (b)Amino acids are the end products of protein digestion. Describe what happens to these amino acids from the point of digestion until they reach the liver.[4]
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.
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [6] diagram G: amylase;
- mouth/small intestine/duodenum ;
- maltose end product;
- diagram H: small intestine/duodenum ;
- fat/lipid/oil;
- fatty acid (s);
- glycerol;
- [max 4] reference to absorption/diffusion ;
- villi;
- capillary;
- blood/plasma ;
- reference to hepatic portal vein ;
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