2.9 Food tests
Exam question
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Which reagent is used to test for starch?
(1)Total for this question: 1 mark
2(c) BIOLOGICAL MOLECULES · EXAM QUESTIONS
2.9 Food tests
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2.9 Food tests
Exam question
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Which colour shows a positive result with Benedict’s solution?
(1)Total for this question: 1 mark
2.9 Food tests
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Which result shows protein is present when biuret reagent is added?
(1)Total for this question: 1 mark
2.9 Food tests
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Which observation shows fat is present after the ethanol test?
(1)Total for this question: 1 mark
2.9 Food tests
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Which test needs the mixture to be heated?
(1)Total for this question: 1 mark
2.9 Food tests
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A food turns iodine blue-black and gives a blue result with Benedict’s. Which does the food contain?
(1)Total for this question: 1 mark
2.9 Food tests
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Describe how to test a food sample for glucose.
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Total for this question: 3 marks
2.9 Food tests
Exam question
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Describe how to test a food sample for starch.
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Total for this question: 2 marks
2.9 Food tests
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Describe how to test a food sample for protein.
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Total for this question: 2 marks
2.9 Food tests
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Describe how to test a food sample for fat.
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Total for this question: 3 marks
2.9 Food tests
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Give one safety precaution when carrying out the emulsion test.
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Total for this question: 1 mark
2.9 Food tests
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Explain why a water bath is used instead of a Bunsen flame to heat Benedict’s solution.
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Total for this question: 2 marks
2.9 Food tests
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Explain why the food is crushed and mixed with water before the Benedict’s test.
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Total for this question: 2 marks
2.9 Food tests
Exam question
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Suggest why the Benedict’s test can show roughly how much glucose is present.
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Total for this question: 2 marks
2.9 Food tests
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A student adds iodine to a potato slice and the slice turns blue-black. Explain the result.
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Total for this question: 2 marks