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Culturing Microorganisms (biology Only) (GCSE Biology)

The following is a GCSE Biology test covering 'Culturing Microorganisms (biology Only)' from the broader topic Cell Biology. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

How can students estimate the original number of bacteria in a liquid sample using plate counts?
Why is it risky to incubate environmental bacterial samples at 37 °C in an unregulated setting?
What is the purpose of streaking bacteria across an agar plate?
Why is it important to use sterile equipment (e.g. sterile loops) when transferring microbes?
What is the purpose of adding an indicator (e.g. red to yellow change) in some microbiological media?
Which factor on an agar plate would indicate you might be growing a different species rather than a mutant of the same species?
Which laboratory practice reduces the chance of contaminating a microbial culture?
What is the main reason for wearing gloves and eye protection when handling microbial cultures?
How can the optical density (turbidity) of a liquid bacterial culture be used?
Why are Petri dishes usually incubated upside down (agar side up)?
Which method produces a pure single bacterial colony useful for later experiments?