2.2 Carbohydrates - Monosaccharides

Question 1

What is the basic monomer unit of a carbohydrate?

Answer 1

A sugar (saccharide)

Question 2

What is a single sugar called?

Answer 2

A monosaccharide

Question 3

What is a pair of monosaccharides called?

Answer 3

A disaccharide

Question 4

What do you call a group of monosaccharides

Answer 4

Polysaccharides

Question 5

What is the best-known monosaccharide?

Answer 5

Glucose

Question 6

What is the test for reducing sugars?

Answer 6

Benedict’s test

Question 7

How do you carry out the Benedict’s test?

Answer 7

Add 2cm3 of the food sample to be tested to a test tube. If it is not in liquid form, grind it up in water. Add an equal volume of Benedict’s reagent. Heat the mixture in a gently boiling water bath for 5 minutes.

Question 8

What colour would you expect after conducting the Benedict’s test with the concentration of sugar being zero?

Answer 8

Blue

Question 9

What colour would you expect after conducting the Benedict’s test with the concentration of sugar being very low?

Answer 9

Green

Question 10

What colour would you expect after conducting the Benedict’s test with the concentration of sugar being low?

Answer 10

Yellow

Question 11

What colour would you expect after conducting the Benedict’s test with the concentration of sugar being medium?

Answer 11

Orange

Question 12

What colour would you expect after conducting the Benedict’s test with the concentration of sugar being high?

Answer 12

Red