Which statements comparing biological molecules are correct? 1 A collagen molecule is a fibrous protein made up of many amino acids with hydrophobic R-groups, whereas a haemoglobin molecule is a globular protein with no amino acids with hydrophobic R-groups. 2 Breaking down sucrose by hydrolysis causes glycosidic bond breakage and yields equal amounts of fructose and $\alpha$-glucose molecules, whereas hydrolysis of cellulose gives only $\beta$-glucose molecules. 3 The glycosidic bonds in glycogen are formed between two $\alpha$-glucose molecules, whereas in amylopectin the bonds are formed between an $\alpha$-glucose molecule and a $\beta$-glucose molecule.
- A1 and 2
- B1 and 3
- C2 only
- D3 only