Edexcel International A Level Biology

Revision Notes

4.10 Bacterial Growth Conditions

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How Bacterial Growth Can Affect Plants

  • Bacteria are microscopic prokaryotes (meaning their cells do not contain a nucleus or membrane-bound organelles)
  • Some may cause disease in both plants and animals
  • Bacteria are often used in studies to test the antimicrobial properties of substances
    • Antimicrobial means that the substance will either kill microbes (i.e. bacteria) or prevent their growth
  • In order to perform these investigations, it is important to create an environment with all the conditions necessary for bacterial growth to occur
  • Bacteria require the following conditions to survive and reproduce:
    • They require nutrients, which provide them with the materials needed to grow and respire
    • Those that respire aerobically will need a sufficient supply of oxygen
    • The temperature and pH of the environment must not be too high or too low to allow enzymes that control metabolic processes to function optimally

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Author: Marlene

Marlene graduated from Stellenbosch University, South Africa, in 2002 with a degree in Biodiversity and Ecology. After completing a PGCE (Postgraduate certificate in education) in 2003 she taught high school Biology for over 10 years at various schools across South Africa before returning to Stellenbosch University in 2014 to obtain an Honours degree in Biological Sciences. With over 16 years of teaching experience, of which the past 3 years were spent teaching IGCSE and A level Biology, Marlene is passionate about Biology and making it more approachable to her students.