Section 2. Biological molecules for Biology, A Level - revisedeck

2. Biological molecules

A section of Biology, 9700

Listing 10 of 748 questions

A sample of food was heated with Benedict’s solution which changed colour to green. A second sample of the same food was boiled with dilute hydrochloric acid and neutralised using sodium hydrogencarbonate. It was then heated with Benedict’s solution which changed colour to red. What did these results show?

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MCQ

2021

Paper 1, Variant 1

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A student carries out a semi-quantitative test with Benedict’s solution. Which statement about this procedure is correct?

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MCQ

2021

Paper 1, Variant 2

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Four solutions were tested for the presence of four different biological molecules. The appearance of the solutions after each test are shown...

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MCQ

2021

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Samples of glucose, sucrose, and a mixture of glucose and sucrose were divided into two halves M and N. M was then tested with Benedict’s solution. N was boiled with dilute hydrochloric acid, neutralised and then tested with Benedict’s solution. The colour of the solution was compared to colour standards. Which table identifies the correct colour changes for these samples?

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MCQ

2022

Paper 1, Variant 1

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Four extracts from different plant materials were made and tested with Benedict’s solution. The extracts were boiled with Benedict’s solution for 240 seconds and the final colour was recorded. extract colour produced after 240 seconds red yellow blue green Which sequence of plant extracts represents an increasing quantity of reducing sugar?

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MCQ

2022

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The concentration of reducing sugar in a solution can be found if an observational measurement is compared to a standard. Which observational measurement could be used to estimate the concentration of reducing sugar in an unknown solution?

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MCQ

2022

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Trehalose is a sugar that gives a negative result when tested with Benedict’s solution. A molecule of trehalose forms two -glucose molecules when it is hydrolysed. Which row is correct?

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MCQ

2022

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The table shows some steps that can be made in carrying out the Benedict’s test. Which combination of steps is required to carry out a semi-quantitative test on a reducing sugar solution?

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MCQ

2023

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Which set of steps is the best method for conducting the emulsion test for lipids?

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MCQ

2023

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A student was provided with a solution of carbohydrate. They removed two samples from the solution and performed tests on each sample, as shown...

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MCQ

2023

Paper 1, Variant 2

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Questions Discovered

748