(a) Complete Table 6.1 to show the names, functions and sites of action of the three different digestive enzymes.
Table 6.1
| name of enzyme | function | site of action |
|---|---|---|
| pepsin | ||
| trypsin | ||
| breaks down maltose to glucose |
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Image 15: 0610_m22_qp_42_17.jpg
(b) Enzymes are proteins.
Fig. 6.1 shows the stages involved in protein synthesis.
Fig. 6.1
(i) State the name of the parts represented by the letters A and C in Fig. 6.1.
A .............................................................................................................
C ............................................................................................................. [2]
(ii) Describe the events that occur during stage 2 in Fig. 6.1.
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(iii) State what determines the order in which the parts labelled B are assembled.
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(c) The shape of a protein is very important for its function.
Explain the importance of shape for the function of an enzyme.
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[Total: 11]
Image 16: 0610_m22_qp_42_18.jpg
(a) Fig. 7.1 shows some cells from a leaf.
Fig. 7.1
(i) Measure the length of the cell labelled D in Fig. 7.1.
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(ii) Calculate the actual length of the cell labelled D in Fig. 7.1. The magnification of Fig. 7.1 is ×400.
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(b) Describe the functions of the cell labelled C in Fig. 7.1.
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(c) Outline the method that you would use to view a slide of leaf cells using a light microscope.
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[Total: 11]
