Biomolecules and carbohydrates
Answers are for parents and teachers.
1
Give one example each of a monosaccharide, disaccharide and polysaccharide and the food rich in each.
Glucose: grapes; sucrose: sugar beet; starch: potato, rice.
2
One slice of bread contains 30 g of carbohydrate. How many kJ of energy do four slices give when fully broken down in the body? (1 g of carbohydrate = 17.6 kJ)
2112
3
Calculate the molecular mass of glucose (C = 12, H = 1, O = 16).
180
4
Why does a plant cell contain a lot of carbohydrate?
Because of the cellulose wall and starch reserves; glucose is made in photosynthesis.
5
Why do athletes eat carbohydrate-rich food before competitions?
Carbohydrate is a quick source of energy; glycogen reserves build up in the muscles.