But, Ammonia, due to the weaker bonds to the hydrogens as compared to water, has some different properties than water. So, the oceans would likely freeze solid. So, even Ammonia wouldn't be a great liquid to dissolve biologically important molecules in. So, in searching for life on other plants, we would want to look to signs of water. Enzymes convert some proteins into other proteins, help in making proteins, and help make non-proteins, like lipids, carbohydrates, etc.
Proteins consist of a non-branched chain of amino acids , hooked end to end.
There are twenty-some different kinds of amino acids so the sequence of different kinds of amino acids can produce millions of different kinds of proteins, potentially. Some are globular proteins, like hemoglobin . Others are sheets, like silk or extended helicies, like keratin . Simple carbohydrates include glucose. Starch, Cellulose, and Glycogen are long, branched, chains of glucose.