Monosaccharides and disaccharides Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. Which disaccharide contains galactose?
- A. Maltose
- B. Sucrose
- C. Lactose
- D. Glucose
2. A sample stays blue when heated with Benedict's reagent. Which conclusion is correct?
- A. It contains no reducing sugar
- B. It contains glucose
- C. It contains maltose
- D. It contains lactose
3. What is the difference between α-glucose and β-glucose?
- A. The number of carbon atoms
- B. The position of the OH group on carbon 1
- C. Their molecular formula
- D. Only α-glucose is a monosaccharide
4. Which sequence correctly shows a positive Benedict's result for a reducing sugar?
- A. Blue to purple
- B. Blue to green to yellow to orange to brick-red
- C. Brown to blue-black
- D. Colourless to white emulsion
5. Why is sodium hydrogencarbonate added after boiling sucrose with acid?
- A. To hydrolyse the glycosidic bond
- B. To neutralise the acid so Benedict's reagent works
- C. To make the sugar reducing
- D. To turn the solution blue