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21 / 03 Thursday Learning objectives: Draw and label a bacterial cell

21 / 03 Thursday Learning objectives: Draw and label a bacterial cell Classify bacteria according to their shape. Starter Draw a plant cell and label these parts – nucleus, cell wall, cell membrane, cytoplasm, vacuole Define the term ‘micro-organism’

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21 / 03 Thursday Learning objectives: Draw and label a bacterial cell

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  1. 21 / 03 Thursday Learning objectives: Draw and label a bacterial cell Classify bacteria according to their shape

  2. Starter Draw a plant cell and label these parts – nucleus, cell wall, cell membrane, cytoplasm, vacuole Define the term ‘micro-organism’ What are the three groups of micro-organisms?

  3. What are microbes? Microbes are very small living things and are sometimes called micro-organisms. Microbes are so tiny that they cannot be seen with the naked eye. They can only be seen using a microscope. Because they are so small, we measure them using a unit called a micrometre.

  4. Different types of microbes There are three types of microbes: microbes bacteria viruses fungi

  5. Bacteria

  6. Bacteria are the most common form of life on earth, they are found everywhere.

  7. Bacteria are very small: • Between 0.5 ~ 8.0 micrometres • Approximately 1000 bacteria will fit into 1 mm

  8. Bacteria are made of only one cell = unicellular (We are multicellular)

  9. Structure of Bacteria

  10. Bacteria come in a variety of shapes

  11. Bacteria come in a variety of shapes: • Spheres (coccus) – Streptococcus (causes sore throats) • Rods – Bacillus (causes typhoid & anthrax) • Spirals – Spirillum(causes syphilis & campylobacter)

  12. Cocci - Spherical

  13. Strep throat is caused by streptococcus

  14. Bacilli – Rod-shaped

  15. Vibrio – Comma shaped

  16. Gone Fishin’

  17. Spirillum – Spiral shaped

  18. 22 / 03 Friday • Learning objectives: • Describe how bacteria reproduce (binary fission) • Describe and explain the bacterial growth curves

  19. Bacterial Reproduction – Binary Fission

  20. Starting with a single bacterium which multiplies every 20 minutes, how many bacteria would there be after: One hour? Three hours? Six hours? Nine hours? One day?

  21. How long would it take for a single bacterium to multiply into… One thousand? One million? One billion? One trillion? One googol (10100)?

  22. Bacterial Growth Curves

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