Core Practical: Investigating antibiotics & antiseptics (Edexcel GCSE Biology Combined Science): Flashcards
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Practise the cards
10 cards from this deck
What are agar plates used for in this practical?
What are agar plates used for in this practical?
Testing effectiveness of antibiotics/antiseptics/plant extracts
Equipment to sterilise Petri dishes & agar
Equipment to sterilise Petri dishes & agar
Autoclave
Reason for sterilising equipment
Reason for sterilising equipment
Prevents unwanted bacteria contaminating the experiment
Max incubation temp in schools
Max incubation temp in schools
25°C
Reason for 25°C max in schools
Reason for 25°C max in schools
Prevents growth of harmful pathogens
Zone of inhibition
Zone of inhibition
Clear area around disk where bacteria killed or growth prevented
Meaning of larger zone of inhibition
Meaning of larger zone of inhibition
More effective antimicrobial agent
Reason for storing plates upside down
Reason for storing plates upside down
Stops condensation contaminating bacterial culture
Reason for partial (not full) sealing
Reason for partial (not full) sealing
Allows oxygen in, prevents anaerobic bacteria growth
Purpose of control disk
Purpose of control disk
Ensures accurate comparisons