English National Curriculum - Science

Factors affecting enzyme activity

Mission Objectives

Explain the term optimum temperature and pH in relation to enzyme action

Explain how enzyme action is altered due to changes in pH or temperature

Interpret graphs relating to enzyme changes and calculate rate of reaction at given times

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Keywords

Words and meanings to learn

optimum temperature

the temperature at which an enzyme-substrate reaction works best at.

optimum pH

the pH at which an enzyme-substrate reaction works best at.

denature

when the enzyme's active site changes shape so it can no longer bind with the substrate and produce a product.

initial reaction

the start of the reaction; this is usually the fastest part of the reaction.

bile

a substance produced by the liver and stored in the gall bladder. It is responsible for emulsifying fats and neutralising the acid mixed with food exiting the stomach.

This lesson has been written by

Samantha Batch

Samantha is an accomplished science educator with over 15 years of leadership experience and a strong background in scientific analysis. She has a proven record of leading departments effectively, improving practice, and working collaboratively with stakeholders.

In her current work, Samantha embeds evidence-informed pedagogical principles such as retrieval practice, clear modelling, and effective sequencing to support high-quality curriculum design and professional development. She draws on assessment insight and common misconceptions to help teachers secure strong student understanding.

She is a former Head of Chemistry and Sixth Form Tutor at Ilkley Grammar School, with extensive Key Stage 4 and 5 experience, and an AQA examiner, giving her valuable insight into assessment standards and exam requirements.

In her spare time, Samantha enjoys playing the accordion with her local orchestra and has recently taken up cricket. 

Required Resources

  • Graph paper
  • Colouring pens
  • A3 sheets of paper,
  • Rulers
  • Calculators
  • Handouts

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