Before transferring microorganisms to a culture medium, a technician disinfects the workbench.
Why is the workbench disinfected before the transfer?
to sterilise the culture medium before microorganisms are added
to stop condensation dripping onto the agar during incubation
to sterilise the inoculating loop before it touches the culture
to reduce contamination of the culture by unwanted microorganisms
87 exam-style questions on Edexcel GCSE Biology 5.3 Immune system and medicines, covering 5.3.1 The specific immune system, 5.3.2 Response to immunisation, 5.3.3 Advantages and disadvantages of immunisation, 5.3.4 Antibiotics and bacterial infections, 5.3.5 Aseptic techniques in culturing, 5.3.6 Cross-sectional areas of cultures, 5.3.7 Stages of developing new medicines, and 5.3.8 Production of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.