Which comparative statements concerning biological molecules are correct?
1 A collagen molecule is a fibrous protein that contains many amino acids with hydrophobic R-groups whereas a haemoglobin molecule is a globular protein with no amino acids with hydrophobic R-groups.
2 Sucrose hydrolysis results in glycosidic bond breakage and the production of equal proportions of fructose and α-glucose molecules, whereas cellulose hydrolysis results in only $\beta $-glucose molecules.
3 The glycosidic bonds of glycogen have been formed between two $\alpha $-glucose molecules, whereas with amylopectin, the bonds have been formed between an $\alpha $-glucose molecule and a $\beta $-glucose molecule.
1 )
1 and 2
2 )
1 and 3
2 only
4 )
3 only
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