Required Practical: Decay (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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12 cards from this deck
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Practise the cards
12 cards from this deck
Enzyme used in decay practical
Enzyme used in decay practical
Lipase
pH indicator used in decay practical
pH indicator used in decay practical
Phenolphthalein
Initial colour of alkaline milk solution
Initial colour of alkaline milk solution
Pink
What does lipase break down in milk?
What does lipase break down in milk?
Fats
Products when lipase breaks down fats
Products when lipase breaks down fats
Fatty acids
What indicates decomposition has occurred?
What indicates decomposition has occurred?
Pink colour disappears (solution becomes acidic)
Effect of temp on decomposition rate (up to optimum)
Effect of temp on decomposition rate (up to optimum)
Rate increases with temperature
What happens to enzyme beyond optimum temperature?
What happens to enzyme beyond optimum temperature?
Enzyme may denature
How to identify highest decomposition rate
How to identify highest decomposition rate
Fastest disappearance of pink colour
3 controlled variables in decay practical
3 controlled variables in decay practical
Lipase conc., milk volume, sodium carbonate amount
Why add sodium carbonate to milk mixture?
Why add sodium carbonate to milk mixture?
To alkalize solution and raise pH (turns pink)
Applications of understanding decay rate
Applications of understanding decay rate
Agriculture, waste management, food preservation