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10. Streptococcus mutans is one species of bacteria which causes tooth decay - Edexcel - GCSE Biology - Question 10 - 2021 - Paper 1
Question 10
10. Streptococcus mutans is one species of bacteria which causes tooth decay. A scientist tested the effectiveness of toothpaste at killing this species of bacteria... show full transcript
Worked Solution & Example Answer:10. Streptococcus mutans is one species of bacteria which causes tooth decay - Edexcel - GCSE Biology - Question 10 - 2021 - Paper 1
Step 1
Which word describes the techniques used to prevent contamination of the agar jelly plate?
Answer
The correct answer is C aseptic. Aseptic techniques are used to prevent contamination in microbiological procedures, ensuring that unwanted microorganisms do not interfere with the experimental results.
Step 2
Give two precautions needed to prevent contamination of the agar jelly plate.
Answer
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Ensure that all equipment, such as petri dishes and inoculating loops, are sterilized before use to eliminate any existing bacteria.
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Work in a sterile environment, such as a laminar flow hood, to minimize exposure to airborne contaminants.