Cow’s milk contains proteins, fats and carbohydrates - VCE - SSCE Chemistry - Question 2 - 2023 - Paper 1
Question 2
Cow’s milk contains proteins, fats and carbohydrates. The main carbohydrate in cow’s milk is lactose. The reaction for the breakdown of lactose is catalysed by the e... show full transcript
Worked Solution & Example Answer:Cow’s milk contains proteins, fats and carbohydrates - VCE - SSCE Chemistry - Question 2 - 2023 - Paper 1
Step 1
Name the circled linkage.
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Answer
The circled linkage is called a glycosidic link. This is the bond formed between the monosaccharides in lactose.
Step 2
Explain what the GI of a food indicates.
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Answer
The glycemic index (GI) of a food indicates how quickly carbohydrates in that food raise blood glucose levels after consumption. A food with a high GI will cause a rapid increase in blood sugar, while a low GI food results in a gradual rise.
Step 3
State why the breakdown of lactose, as shown above, contributes to the GI of lactose.
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Answer
The breakdown of lactose by lactase produces glucose and galactose, both of which are absorbed rapidly into the bloodstream. This rapid absorption contributes to a higher glycemic index for lactose compared to other carbohydrates that may be digested more slowly.
