0653.B5.1.01 — Describe enzymes as proteins that are involved in all metabolic reactions, where they function as biological catalysts: past paper questions
Real questions on 0653.b5.1.01 — describe enzymes as proteins that are involved in all metabolic reactions, where they function as biological catalysts
The newest 20 of 24 written questions. Open one to see it on the real paper.
- 0653/43 · October/November 2025 · Q1b(i)[1]
Identify the enzyme in Fig. 1.2 with optimum activity in the stomach.
See it on the paper → - 0653/43 · October/November 2025 · Q1c[2]
Lipase is an enzyme in the digestive system. Complete the sentence about the function of lipase. Lipase breaks down and into two types of
See it on the paper → - 0653/41 · May/June 2025 · Q1a(i)[1]
State the name of the enzyme that breaks down fats.
See it on the paper → - 0653/41 · May/June 2025 · Q1a(ii)[1]
Circle one product of fat digestion.
See it on the paper → - 0653/32 · October/November 2024 · Q1b(i)[2]
Complete the definition of enzymes. Enzymes are that function as
See it on the paper → - 0653/33 · October/November 2024 · Q1b(i)[2]
Complete the definition of enzymes. Enzymes are that function as
See it on the paper → - 0653/33 · October/November 2024 · Q1b(ii)[2]
Fig. 1.2 is a graph showing the effect of temperature on an enzyme. enzyme activity 0 0 10 20 30 40 50 60 70 80 temperature / °C Fig. 1.2 Describe the effect of temperature on enzyme activity shown in Fig. 1.2. Include data in your answer.
See it on the paper → - 0653/61 · May/June 2024 · Q1av[1]
Describe the effect of copper sulfate on the reaction.
See it on the paper → - 0653/61 · May/June 2024 · Q1aviii[1]
Explain why the test-tubes were left for 3 minutes in a water-bath in step 2.
See it on the paper → - 0653/12 · October/November 2023 · Q3[1]
What are enzymes made from?
See it on the paper → - 0653/43 · October/November 2023 · Q4b(ii)[3]
Explain the effect of a temperature of 20 °C on the activity of the enzyme.
See it on the paper → - 0653/61 · October/November 2023 · Q1a(iii)[1]
Use the results to suggest why this enzyme is used in the large-scale production of apple juice.
See it on the paper → - 0653/61 · October/November 2023 · Q1a(vi)[1]
Suggest why it is important to use a clean glass rod in step 5.
See it on the paper → - 0653/63 · October/November 2023 · Q2[7]
Urease is an enzyme that breaks down urea in solution to form aqueous ammonia. Urea in solution is almost neutral. The aqueous ammonia formed increases the pH of the solution. Plan an investigation to determine the relationship between the concentration of urease and the pH of the solution formed. You are provided with...
See it on the paper → - 0653/63 · October/November 2023 · Q3a(i)[1]
Use Fig. 3.1 to estimate the pH of the solution of H.
See it on the paper → - 0653/62 · May/June 2023 · Q2[7]
The enzyme amylase breaks down starch to form a reducing sugar. Iodine is a brown solution that turns blue/black in the presence of starch. Plan an investigation to determine the relationship between temperature and the time taken to completely break down starch by amylase. You are provided with: • • • 1% amylase solut...
See it on the paper → - 0653/32 · February/March 2023 · Q1c[1]
All enzymes are made from one type of molecule. Circle this type of molecule. fat fibre protein vitamin
See it on the paper → - 0653/42 · February/March 2023 · Q4a[1]
Enzymes are found in living organisms. Complete the definition of enzymes. Enzymes are proteins that function as biological .
See it on the paper → - 0653/42 · February/March 2023 · Q4b(i)[1]
The Arctic Ocean has a temperature of approximately –1.8 °C. Identify which enzyme shown in Fig. 4.1 is most likely from an organism that can live in the Arctic Ocean. enzyme
See it on the paper → - 0653/42 · February/March 2023 · Q4c[3]
Table 4.1 shows some of the names and functions of enzymes in the alimentary canal of humans. Complete Table 4.1. Table 4.1 enzyme protease function breaks down starch into simple sugars breaks down into
See it on the paper →
What examiners said
Lipase, was very frequently stated. The most common incorrect suggestion was amylase.
— Examiner report, May/June 2025, 0653/41 Q1(a)(i) (Cambridge)
Glycerol was very frequently identified. Amino acid was the most popular incorrect suggestion.
— Examiner report, May/June 2025, 0653/41 Q1(a)(ii) (Cambridge)
Most candidates chose the correct option (protein), however a significant proportion incorrectly thought that enzymes are made of starch.
— Examiner report, October/November 2023, 0653/12 Q3 (Cambridge)
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