In class, we mentioned that nature uses a few chemical building blocks to form complex biomolecules. In this exercise, look up the structure for each of these three important biomolecules. First, write about their roles in cell physiology and identify the chemical constituents (building blocks) that are part of each molecule: a) Guanosine triphosphate (GTP) b) Methionine enkephalin c) Phosphatidylcholine