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?
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