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QLDBiologyQuick questions
Unit 1: Cells and multicellular organisms
Quick questions on Enzymes as biological catalysts and factors affecting activity (QCE Biology Unit 1)
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is factors affecting enzyme activity?Show answer
Enzyme activity is usually measured as reaction rate (product formed or substrate consumed per unit time).
What is q1?Show answer
Explain why an increase in temperature from 20 to 35 degrees Celsius increases enzyme activity but a further increase to 60 degrees Celsius reduces it. [3 marks]
What is q2?Show answer
A student measured the volume of gas produced by catalase from liver in five buffers at pH 4, 6, 7, 8 and 10, recording 2, 14, 22, 8 and 1 mL after 60 seconds. Identify the optimum pH and justify whether the data support classifying catalase as a human intracellular enzyme. [3 marks]
What is q3?Show answer
Refer to a competitive and a non-competitive inhibitor of the same enzyme. (a) Distinguish the two modes of inhibition. (b) Predict how each affects Vmax and Km on a substrate-rate graph.
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