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 °C with Benedict’s solution gave a brick red 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 °C with Benedict’s
solution gave a brick red 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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