0654.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 0654.b5.1.01 — describe enzymes as proteins that are involved in all metabolic reactions, where they function as biological catalysts
The newest 11 of 11 written questions. Open one to see it on the real paper.
- 0973/31 · May/June 2026 · Q4b(ii)[2]
The desert pupfish have specially adapted enzymes that function in this temperature range. Describe what is meant by the term enzyme.
See it on the paper → - 0973/31 · May/June 2024 · Q10a[4]
Fig. 10.1 shows the activity of some bacterial enzymes at different temperatures. C A D enzyme activity E B –10 0 10 20 30 40 50 60 70 80 90 100 110 temperature / °C Fig. 10.1 Complete the sentences to describe the results in Fig. 10.1. The only two enzymes active at 60 °C are enzymes and . The greatest activity for en...
See it on the paper → - 0973/31 · May/June 2024 · Q10c[1]
Enzymes are proteins. Circle the elements that all proteins are made from. carbon calcium oxygen hydrogen nitrogen
See it on the paper → - 0973/41 · October/November 2023 · Q7a[6]
A scientist measures the activity of the enzyme amylase at different temperatures. Fig. 7.1 shows a graph of the results. 120 100 80 enzyme activity / arbitrary units 60 40 20 0 0 10 20 30 40 50 60 70 80 temperature / °C Fig. 7.1 Complete the sentences to describe and explain the results in Fig. 7.1. Amylase breaks dow...
See it on the paper → - 0973/41 · October/November 2022 · Q7e[1]
State the name of the enzyme that breaks down proteins.
See it on the paper → - 0973/32 · May/June 2022 · Q4c[1]
Complete this definition of an enzyme. Enzymes are proteins that function as catalysts.
See it on the paper → - 0973/31 · May/June 2021 · Q10d[2]
Germination is an enzyme‑controlled reaction. The investigation is repeated with boiled seeds. Describe the effect of boiling on the germination of seeds. Give one reason for your answer. effect reason
See it on the paper → - 0973/42 · May/June 2021 · Q4b[2]
Carbon dioxide produced by yeast causes bread to rise. The temperature used during bread-making is carefully controlled. At very high temperatures no carbon dioxide is produced. Explain why. Use ideas about enzymes in your answer.
See it on the paper → - 0973/31 · May/June 2020 · Q4b(i)[2]
Define the term enzyme.
See it on the paper → - 0973/41 · May/June 2019 · Q13b[3]
A student tests different solutions for the nutrients they contain. Table 13.1 shows the results. Table 13.1 solution colour with iodine solution colour with Biuret solution colour with Benedict’s solution A blue-black blue red B yellow-brown blue blue C blue-black purple red D yellow-brown blue red E blue-black blue g...
See it on the paper → - 0973/42 · May/June 2019 · Q1a(ii)[2]
Explain the results in Fig. 1.1 at 60 °C.
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What examiners said
The majority of candidates identified the optimum temperature as 25 °C, amylase particles gain kinetic energy and at temperatures above 75 °C all the amylase has become denatured. Fewer candidates identified the substrate as starch, the product as simpler sugars and the active site having changed in shape.
— Examiner report, October/November 2023, 0973/41 Q7(a) (Cambridge)
Some candidates correctly suggested that the seeds would not germinate. Fewer were able to explain why in terms of enzymes being denatured. Many candidates suggested that germination and growth would be improved due to the higher temperature.
— Examiner report, May/June 2021, 0973/31 Q10(d) (Cambridge)
The strongest responses included an explanation that followed logically from the results, typically that solution C contained an enzyme because enzymes are proteins and proteins turn Biuret reagent purple.
— Examiner report, May/June 2019, 0973/41 Q13(b) (Cambridge)
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