Questions About Enzymes

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Enzymes
1 Enzymes are used in biological detergents.
1 (a) Name the type of enzyme that digests stains containing fats.
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(1 mark)
1 (b) A new detergent is marketed as being `environmentally-friendly'.
Scientists compared the performance of this new detergent with an existing detergent.
They measured the time taken by the two detergents to remove a fat stain at different
temperatures.
The graph shows their results.
1 (b) (i) Describe the effect of increasing the temperature on the time taken by the existing
detergent to remove the stain.
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(2 marks)
1 (b) (ii) The new detergent works at a lower temperature than the existing one.
Is the new detergent likely to be more `environmentally-friendly' than the existing detergent?
Draw a ring around your answer. Yes / No
Explain the reason for your answer.
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(2 marks)

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Neither detergent works well at 60 °C.
Explain why.
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(2 marks)
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2 Gardeners often put waste materials onto compost heaps.
The graph shows how the conditions in a compost heap affect how quickly waste materials in the
heap decay.
2 (a) (i) Describe the effect of increasing the temperature from 15 °C to 25 °C on the rate of decay at
20 % oxygen concentration.
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Explain why.
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(1 mark)
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4 A manufacturer is trying to improve the quality of the biological detergent he produces.
Scientists at his company carried out the following experiments on enzymes:
· Samples of lipase were collected from five different types of bacterium, A, B, C, D and E.
· The samples were diluted to give the same concentration of lipase.
· Agar jelly containing a lipid was prepared in a dish.…read more

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Which type of bacterium, A, B, C, D or E, produced the most effective lipase in this
investigation?
Write your answer, A, B, C, D or E, in the box.
(1 mark)
4 (a) (ii) Explain your answer.
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(1 mark)
4 (b) The manufacturer plans to add the most effective lipase to the washing powders he produces.
Suggest two other factors he should investigate before deciding which lipase is the most effective.
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Explain why less light passes through the mixture when the starch is more concentrated.
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(1 mark)
3 (b) The manufacturer adds carbohydrase from each of three different microorganisms, A, B and C,
to starch in flasks at 40 °C.
Every minute a sample of the mixture is added to iodine solution and placed in the colorimeter.
Graph 2 shows these results.…read more

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Some people are concerned about the distance that food is transported between the grower and
the supermarket.
The bar chart shows the distances for some foods.
2 (a) Both imported carrots and carrots grown locally in the UK can be bought in supermarkets all year
round.
How many times further are imported carrots transported than carrots grown locally in the UK?
Show clearly how you work out your answer.
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Starch is broken down into sugar by amylase. Amylase is produced in the salivary glands.
6 (a) Name two other organs in the digestive system which produce amylase.
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(2 marks)
6 (b) A colorimeter measures colour intensity by measuring the percentage of light that passes
through a solution.
Graph 1 shows the percentage of light passing through sugar solutions of different concentrations to
which a test reagent has been added.…read more

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Explain why.
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(2 marks)
6 (c) Graph 2 shows how the readings from the colorimeter changed over the next
20 minutes.
6 (c) (i) Use Graph 1 and Graph 2 to determine the concentration of sugar in the mixture from organ
Q after 20 minutes.
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Answer ..........................mol per dm3
(1 mark)
6 (c) (ii) Use your answer to 6(c)(i) to calculate the rate at which sugar was produced in the mixture
containing amylase from organ Q.…read more

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Comments

Swallowtail

This is a useful set of questions on enzymes that also have a set of answers supplied by the same user. It is always useful to look at sample examination questions to see what can be asked and to check out what is being awarded marks in the mark scheme. 

https://getrevising.co.uk/resources/enzymes_answers


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