For each molecule, which row is the correct one?
- Acollagen has a structural function found in blood vessel walls; haemoglobin contains the elements carbon, hydrogen, iron, nitrogen and sulfur; sucrose is formed by releasing a molecule of water in a hydrolysis reaction
- Bcollagen molecules consist of three polypeptide chains linked by ionic bonds; each non-protein haem group contains a central iron ion; sucrose is composed of two monosaccharides linked by a glycosidic bond
- Ccollagen molecules lie parallel to each other, with cross-links and staggered ends; haemoglobin has two identical $\alpha$ chains and two identical $\beta$ chains; sucrose is formed by condensation of two identical monosaccharides
- Dcollagen polypeptide chains interact to produce a fibrous protein; haemoglobin has all four levels of protein structure and at least four types of bond; digestion yields glucose and fructose in equal proportions