A student carried out tests for biological molecules on the same sample of milk.
The tests and their results were as follows.
● Heating to ${80^ \circ }C$ with Benedict’s solution gave a red colour.
● Boiling with acid, followed by neutralisation, then heating to ${80^ \circ }C$ with Benedict’s solution also gave a red colour.
● Adding Biuret solution gave a purple colour.
● Adding iodine solution gave a yellow colour.
Which biological molecules must be present in the milk?
1 non-reducing sugars
2 protein
3 reducing sugars
4 starch
1 )
1, 2 and 3
2 )
1 and 2 only
2 and 3 only
4 )
3 and 4
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