English National Curriculum - Science

Preventing bacterial growth

Mission Objectives

Explain how bacteria reproduce and why their numbers can increase quickly

Calculate how many bacteria are produced over time using mean division time

Calculate the area of bacterial colonies or clear zones using πr²

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Keywords

Words and meanings to learn

binary fission

a simple type of cell division used by bacteria where one cell divides into two identical daughter cells

inhibition zone

a clear area around an antibiotic disc where bacteria have not grown, showing how effective the antibiotic is

sterilise

to kill all microorganisms on equipment or culture media, usually by heating, to prevent contamination

aseptic technique

method used to prevent contamination when growing microorganisms, ensuring only the intended bacteria grow

mean division time

the average time it takes for one bacterial cell to divide into two, used to calculate population growth

This lesson has been written by

Samantha Batch

Samantha is an accomplished science educator whose current work centres on curriculum design and professional development, supporting teachers to deliver high-quality science education through evidence-informed approaches. She is a former Head of Chemistry and Sixth Form Tutor with extensive Key Stage 4 and 5 experience, and has worked as an AQA examiner, giving her valuable insight into assessment standards and what students need to succeed.

Underpinning this is a strong foundation in applied science built across a range of industry roles. Samantha has held scientific roles at John Smith's Brewery, Yorkshire Water and WasteCare, where she led technical projects, drove operational efficiencies and ensured compliance with industry standards. Across these roles she has first-hand experience of how scientific knowledge translates into measurable outcomes in professional and commercial environments.

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

Required Resources

  • Agar plates from the previous lesson
  • Rulers
  • Scientific calculators
  • Handouts

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