1.1.2

Bacteria

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Growing Microorganisms

Cultures of microorganisms (microorganisms grown in a lab) can be used to investigate the effects of antibiotics and disinfectants, which both kill bacteria. Microorganisms can be grown in two mediums (materials) that contain everything that bacteria need to survive.

Agar gel plate

Agar gel plate

  • Microorganisms can be grown as colonies on an agar gel plate.
Nutrient broth

Nutrient broth

  • Microorganisms can be grown within a solution of a nutrient broth.
  • This contains carbohydrates as an energy source, minerals and sometimes other chemicals.

Calculating Area

The equation for calculating the area of a circle is: Area = π x radius2.

Clear-zones

Clear-zones

  • Samples of certain antiseptics or antibiotics can be added to bacterial cultures. The area free of bacteria around the sample can then be calculated.
  • This technique is useful for testing how well different antibiotics work. It's also useful for identifying bacteria or other microorganisms based on the antimicrobials that affect their growth.
Bacterial cultures

Bacterial cultures

  • The size of bacterial cultures can be measured by the area of the colony.
  • This is useful for determining how different conditions affect bacterial growth rates.
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1

Biology

1.1

Practicals

1.1.1Microscope & Bacteria1.1.2Bacteria1.1.3Osmosis Tests1.1.4Osmosis & Food Tests1.1.5Enzymes1.1.6Enzymes 21.1.7Photosynthesis & Plant Responses1.1.8Photosynthesis Experiments1.1.9Reaction Time1.1.10Quadrats1.1.11Decay
2

Chemistry

2.1

Practicals

2.1.1Salts2.1.2Neutralisation2.1.3Titration2.1.4Electrolysis2.1.5Electrolysis 22.1.6Rate of Reaction2.1.7Rate of Reaction 22.1.8Chromatography2.1.9Identifying Gases2.1.10Identifying Gases 22.1.11Identifying Ions2.1.12Carbonates, Halides & Sulfates2.1.13Flame Emission Spectroscopy2.1.14Water Purification2.1.15Water Purification 2
3

Physics

3.1

Practicals

3.1.1Specific Heat Capacity3.1.2Thermal Capacity & Insulation3.1.3Latent Heat3.1.4Resistance & Current3.1.5Resistance & Current 23.1.6Density3.1.7Density 23.1.8Force & Extension - Springs3.1.9Waves - Ripple Tank3.1.10Light3.1.11Light Reflection & Refraction3.1.12Radiation3.1.13Radiation 2

Practice questions on Bacteria

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    Bacteria can be cultured in several ways. Which of the following is NOT a method?Multiple choice
  2. 2
    What equation would be used to calculate the areas of bacteria killed by the antiseptic/antibiotic, and what would this indicate?Flashcard
  3. 3
    How do bacteria multiply?Multiple choice
  4. 4
    Which of these clear-zone areas (the area free of bacteria) was made by the best antibiotic?Multiple choice
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Microscope & Bacteria

Osmosis Tests