Carbohydrates - exam practice
Carbohydrates
Question 1 of 10
1 of 10
Lactose is formed by a reaction between glucose and galactose, both of which have the chemical formula C6H12O6.
Which option shows the correct chemical formula for lactose?
Question 2 of 10
2 of 10
Carbohydrates, such as starch, are made from monosaccharides joined together.
Which bond joins monosaccharides together?
Question 3 of 10
3 of 10
What can occur during condensation of carbohydrates?
Question 4 of 10
4 of 10
What occurs when sucrose is broken down to monosaccharides?
Question 5 of 10
5 of 10
X and Y show the structures of two hexose sugars.
Which statement is correct?
Question 6 of 10
6 of 10
A sample of milk is tested with Benedict’s solution. After boiling, a yellow colour is observed.
Which conclusion is correct?
Question 7 of 10
7 of 10
Which carbohydrate gives a brick red colour when boiled with Benedict’s solution?
Question 8 of 10
8 of 10
Tests were performed on samples from a mixture of biological molecules.
When iodine in potassium iodide solution was added to a sample, the mixture turned black.
When the biuret test was carried out on another sample, the mixture turned purple.
Which biological molecules were in the mixture?
Question 9 of 10
9 of 10
The structure of a biological molecule is shown below.
Which option correctly describes the molecule?
Question 10 of 10
10 of 10
An unknown solution of a single sugar was tested. After Benedict's test for reducing sugars, the colour observed was blue. After Benedict's test for non-reducing sugars, the colour observed was brick red.
Identify the unknown sugar.