B2 1.2 - Bacteria and Yeast

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Notes from AQA Book:

  • Bacteria are very small and can only be seen with a powerful microscope.
  • Bacterial cells have a cell membrane and a cell wall which surround cytoplasm.
  • Bacteria do not have a nucleus so the genetic material is in the cytoplasm.
  • When bacteria multiply they form a colony. Bacterial colonies can be seen with the naked eye.
  • Yeast is a single-celled organism.
  • Yeast cells have a nucleus, cytoplasm and a membrane surrounded by a cell wall.

Key Points

  • Bacteria are much smaller than plant and animal cells.
  • Yeast is a single-celled organism, which is different from animal and plant cells.

AQA Examiner's Tip

Make sure you can identify the differences between animal cells, plant cells, bacteria and yeast by looking at their features.

Notes from CGP Book:

Bacteria are a type of microorganism. They're tiny-- typically just a few microns (thousandths of a millimetre) wide. But despite their small size, they can have a mighty effect on humans...

Bacterial cells are usually…

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