Lipids, amino acids and proteins
Answers are for parents and teachers.
1
Write two examples each of simple and complex lipids.
Simple: fat, oil, wax. Complex: phospholipid, glycolipid, lipoprotein.
2
How many kJ result from fully breaking down 200 g of fat? (1 g = 38.9 kJ; 38.9 = 389 : 10)
7780
3
An insulin molecule consists of two polypeptide chains: one has 21 amino acids and the other 30. How many peptide bonds are there in both chains altogether?
49
4
Why are fats a more convenient energy reserve than carbohydrates?
One gram of fat gives more energy and is stored compactly without water.
5
Describe in words the reaction that forms a dipeptide.
The –COOH group of one amino acid joins the –NH₂ group of another, water is released and a –CO–NH– bond forms.