Due to the insolubility of large organic molecules, what function do they mainly perform?

Explanation

Option D is correct since it includes both A and B which are right. The insoluble nature of large organic molecules means that it is really difficult for them to pass through the lipid bilayer membranes of cells. So these molecules mainly serve as enzymes ( either on the cell surface or outside ) or play a part in maintaining the structure of cells.Option A is incorrect since it only mentions these large molecules as structural components.Option B is incorrect since it only mentions these large molecules as enzymesOption C is incorrect since these large molecules cannot easily pass through the cell membranes. So, metabolism which involves both catabolism and anabolism involves the production and combination of small molecules respectively is not the function of these large molecules.