Required Practical: Decay (OCR GCSE Biology A (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
Which enzyme is used to break down fats in the milk during the decomposition practical?
Which enzyme is used to break down fats in the milk during the decomposition practical?
Lipase
Which indicator is used to monitor pH changes in the decomposition practical?
Which indicator is used to monitor pH changes in the decomposition practical?
Phenolphthalein
What colour does phenolphthalein turn the solution initially in the practical?
What colour does phenolphthalein turn the solution initially in the practical?
Pink
Why is sodium carbonate added to the milk and phenolphthalein mixture?
Why is sodium carbonate added to the milk and phenolphthalein mixture?
To raise the pH
What does lipase break down in the milk?
What does lipase break down in the milk?
Fats
What does lipase produce when it breaks down fats?
What does lipase produce when it breaks down fats?
Fatty acids
What does the disappearance of the pink colour indicate?
What does the disappearance of the pink colour indicate?
Solution has become acidic
How is the highest rate of decomposition determined in this practical?
How is the highest rate of decomposition determined in this practical?
Fastest pink colour disappearance
What happens to the rate of decomposition as temperature increases initially?
What happens to the rate of decomposition as temperature increases initially?
It increases
What happens to the enzyme beyond its optimum temperature?
What happens to the enzyme beyond its optimum temperature?
It may denature
Which variable must be kept constant to ensure accurate results?
Which variable must be kept constant to ensure accurate results?
Concentration of lipase
In which field is understanding decomposition rates crucial?
In which field is understanding decomposition rates crucial?
Waste management