Question 20
Food Substances and EnzymesThe extract from a food substance reacting with sodium hydroxide and copper sulphate solutions will produce violet to purple coloration if
- A.fats are present
- B.carbohydrate is present
- C.protein is present
- D.reducing sugar is present.
Show the answer and explanation
Answer: C (protein is present)
Explanation
This is the Biuret test: a violet or purple colour shows protein.