The Presence of Lactose in Milk (Leaving Cert Agricultural Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What type of sugar is lactose classified as?
What type of sugar is lactose classified as?
Reducing sugar
What colour change indicates a positive Benedict's test for lactose?
What colour change indicates a positive Benedict's test for lactose?
Blue to brick-red
Why is distilled water used as a control in this experiment?
Why is distilled water used as a control in this experiment?
It contains no reducing sugars
What temperature range should the water bath be maintained at?
What temperature range should the water bath be maintained at?
80-100°C
How long should the test tubes be heated in the water bath?
How long should the test tubes be heated in the water bath?
5 minutes
What percentage of cow's milk is made up of lactose?
What percentage of cow's milk is made up of lactose?
4-5%
What is the active ingredient in Benedict's solution?
What is the active ingredient in Benedict's solution?
Copper sulfate
What structural feature enables lactose to act as a reducing agent?
What structural feature enables lactose to act as a reducing agent?
Free anomeric carbon
What colour indicates a negative result in Benedict's test?
What colour indicates a negative result in Benedict's test?
Remains blue
Will Benedict's test work at room temperature?
Will Benedict's test work at room temperature?
No, heating is essential