Amylose, amylopectin and glycogen are all polysaccharides. Enzyme X removes one maltose molecule at a time from the ends of a polysaccharide molecule by hydrolysis of α-1,4-glycosidic bonds. Which row shows how completely each of these molecules will be hydrolysed by enzyme X? (Assume that each polysaccharide is composed of the same number of monomers before hydrolysis begins.)

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] ...