Culturing Microorganisms (OCR GCSE Biology A (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
What does the culture medium contain to provide energy for microorganisms?
What does the culture medium contain to provide energy for microorganisms?
Carbohydrates
In nutrient broth method, why is the flask stoppered with cotton wool?
In nutrient broth method, why is the flask stoppered with cotton wool?
To prevent air contamination
What do bacteria form when grown on an agar gel plate?
What do bacteria form when grown on an agar gel plate?
Colonies
How are inoculating loops sterilised?
How are inoculating loops sterilised?
Passing through a flame
Why should the Petri dish be stored upside down?
Why should the Petri dish be stored upside down?
Prevents condensation disrupting growth
Why should cultures be incubated at 25 degrees rather than 37 degrees?
Why should cultures be incubated at 25 degrees rather than 37 degrees?
37°C allows harmful human bacteria growth
Why should the Petri dish lid not be completely sealed with tape?
Why should the Petri dish lid not be completely sealed with tape?
Prevents harmful anaerobic bacteria
How fast can bacteria multiply by binary fission?
How fast can bacteria multiply by binary fission?
As fast as every 20 minutes
What is the formula for calculating bacterial population growth?
What is the formula for calculating bacterial population growth?
Bacteria at start × 2^divisions
In antibiotic testing, what should the control disc be soaked in?
In antibiotic testing, what should the control disc be soaked in?
Sterile water
What does a bigger zone of inhibition indicate?
What does a bigger zone of inhibition indicate?
More effective antibiotic