English National Curriculum - Science

Catalysts and enzymes

Mission Objectives

Explain what an enzyme is and why we need them

Describe the lock and key theory of enzyme action

Explain how enzymes are used to break down larger food molecules

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Keywords

Words and meanings to learn

carbohydrase

an enzyme which breaks down carbohydrates into glucose.

protease

an enzyme which breaks down proteins into amino acids.

lipase

an enzyme which breaks down fats into one glycerol molecule and three fatty acid chains

active site

the part of the enzyme which is responsible for binding and breaking down the substrate.

lock and key theory

the theory that the enzyme signifies a lock and the substrate a key which is specific to that lock.

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

  • Art materials such as coloured paper, pipe cleaners and foam shapes
  • Scissors
  • Glue sticks
  • Cardboard,
  • Rulers
  • Handouts

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