1.1.1

Microscope & Bacteria

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Microscopes

We can observe (see) structures within cells (sub-cellular structures) using microscopes.

Population of Bacteria

Bacteria multiply through simple cell division (binary fission), in which one cell divides to produce two cells. The average time for how often the bacteria divide is called the mean division time of that population.

Estimation

Estimation

  • A future population of bacteria can be estimated by multiplying the current population by two for every mean division time (time it takes for the bacteria to divide) that passes.
  • Divisions can occur as frequently as once every 20 minutes in ideal conditions.
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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 Microscope & Bacteria

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  1. 1
    Light Microscope Put in order
  2. 2
    A strain of bacteria has a mean division time of 30 minutes. A group of 4 bacterial cells is left to grow. How many cells will there be at the end of 4 hours?Multiple choice
  3. 3
    A colony of bacteria forms a circle with a diameter of 1.6cm. What is the area of the colony? (π = 3.141) Flashcard
  4. 4
    How do bacteria multiply?Multiple choice
  5. 5
    Which of the following are true of the mean division time of a population of bacteria?True / false
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Bacteria