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5.1. Enzymes
A subsection of Biology, 0610, through 5. Enzymes
Listing 10 of 248 questions
Alcohol can be made by the microorganism yeast. State the balanced chemical equation for the production of alcohol by yeast. Name the organ that breaks down alcohol in the human body. shows a computer model of the enzyme alcohol dehydrogenase, which is the enzyme responsible for breaking down alcohol. Enzymes have a specific three dimensional shape. Explain why the shape of an enzyme is important. Table 5.1 shows the enzyme activity of alcohol dehydrogenase at different temperatures. Table 5.1 temperature / °C enzyme activity / arbitrary units The information in Table 5.1 shows that an increase in temperature increases the activity of alcohol dehydrogenase. Explain why an increase in temperature causes an increase in enzyme activity. State one factor, other than temperature, that affects enzyme activity. A gene is involved in the production of the enzyme alcohol dehydrogenase. Define the term gene. Describe the role of ribosomes in the synthesis of proteins such as enzymes.
0610_m17_qp_42
THEORY
2017
Paper 4, Variant 2
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A researcher investigated the effect of temperature on two different biological washing powders, A and B. Two identical pieces of clothing were stained with the same type of food. The researcher timed how long each washing powder took to remove the stains, at different temperatures. is a graph of the results. temperature / °C A B time taken to remove the stain / minutes Determine the time taken for washing powder A to remove the stain at 20 °C. minutes State why 40 °C is the best temperature to use for washing powder B. A student stated some conclusions for the results shown in . Tick (✓) two boxes that show two correct conclusions for the results shown in . Washing powder B is active over a greater range of temperatures than washing powder A. Washing powders A and B do not work at 50 °C. Washing powders A and B have the same activity at 37 °C. Washing powder A can remove the stain in 15 minutes. Washing powder A is more effective at lower temperatures than washing powder B. State one factor, other than temperature, that affects enzyme activity. Enzymes are biological catalysts. Define the term catalyst. is a diagram showing the action of an enzyme. V W X Z Y State the letter or letters from that represent the: substrate enzyme Lipase is an enzyme commonly found in washing powder. Complete the word equation for the reaction that involves the enzyme lipase. lipase + glycerol
0610_m22_qp_32
THEORY
2022
Paper 3, Variant 2
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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 Enzymes are proteins. shows the stages involved in protein synthesis. C B nuclear membrane DNA nuclear membrane A – codes for a protein stage 3 stage 2 stage 1 DNA not to scale State the name of the parts represented by the letters A and C in . A C Describe the events that occur during stage 2 in . State what determines the order in which the parts labelled B are assembled. The shape of a protein is very important for its function. Explain the importance of shape for the function of an enzyme.
0610_m22_qp_42
THEORY
2022
Paper 4, Variant 2
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Questions Discovered
248