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A-LevelBiologyEnzymesMay/June 2020Paper 3 Q122 Marks

Invertase is an enzyme found in honey. Invertase breaks down sucrose into reducing sugars, as shown in Fig. 1.1. sucrose invertase reducing sugars [Figure 1.1] You will carry out an investigation to determine the concentration of invertase in a sample of honey. The presence of the reducing sugars can be detected by using Benedict's solution. The time taken for the Benedict's solution to first show a colour change can be used to estimate the concentration of invertase in the honey extract, H. You will need to prepare a serial dilution of 1.0% invertase solution, E. You are provided with the materials shown in Table 1.1. Table 1.1 labelled contents hazard volume/cm³ H honey extract none 10 E 1.0% invertase solution harmful irritant 10 B Benedict's solution harmful irritant 30 S 5% sucrose solution none 25 W distilled water none 150 If any solution comes into contact with your skin, wash off immediately under cold water. It is recommended that you wear suitable eye protection.

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Biology Question

Topic

This structured question tests Enzymes in A-Level Biology (syllabus code 9700). It is worth 22 marks.

Source

This question appeared in the Cambridge A-Level Biology May/June 2020 examination, Paper 3 Variant 1.

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