Food crops such as barley and wheat contain gluten. Gluten contains two proteins, glutenin and gliadin.

Haemoglobin consists of two α chains and two β chains. Approximately 5% of all humans have one amino acid in the β ch...

Which row gives the correct description of both a collagen molecule and a collagen fibre? [Table 12.1]

The diagrams show the structures of two amino acids, each of which has two amine (–NH2) groups. A peptide bond is for...

The contraction of striated muscle is explained by the sliding filament model.

The black pigment melanin, which contributes to hair, skin and eye colour, is produced by cells known as melanocytes.

Fig. 7.1 shows a red deer, Cervus elaphus. Red deer are herbivores that feed on a wide range of plants. [Figure 7.1] ...