text: you are given four test tubes containing purified biological macromolecules......? . the test tubes are unlabeled except for a number between 1 and 4. you are told that one test tube contains a protein, one contains a lipid, one contains a carbohydrate, and one contains a nucleic acid. you then perform some tests on the macromolecules and collect the following information: a. test tubes #2 and #4 contain nitrogen, but the other tubes do not. b. the contents of test tube #3 are not soluble in water, but the contents of the other test tubes are soluble in water. c. the contents of test tube #1 can be broken down into subunits that are all exactly identical to each other. d. the macromolecule in test tube #2 is found to have a globular shape. what are the identities of the macromolecules present in the four test tubes? explain how you arrived at your decision test tube #3 is the lipid for that is the only macromolucle given that is not soluble. test tube #1 has to the the carbohydrate for it doesn't contain nitrogen. test tube #2 is the protein beacuse a nucleic acid is not globular. and test tube #4 is the nucleic acid by process of elimintion, and it contain nitrogen.