A student carried out four tests for biological molecules on a sample of milk.
The tests and their results were as follows.
● Heating to ${80^ \circ }C$ with Benedict’s solution gave a green colour.
● Adding Biuret solution gave a purple colour.
● Adding iodine solution gave an orange colour.
● Boiling with acid, followed by neutralisation, then heating to ${80^ \circ }C$ with Benedict’s solution gave a brick red colour.
Which conclusion about these results is correct?
1 )
only protein and reducing sugar present
2 )
only protein and non-reducing sugar present
only protein, reducing sugar and non-reducing sugar present
4 )
only starch, protein and sugar present
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