AP BIOLOGY

Detailed explanation-1: -Large, complex molecules like DNA and protein were missing, but the Miller-Urey experiment showed that at least some of the building blocks for these molecules could form spontaneously from simple compounds.

Detailed explanation-2: -The purpose was to test the idea that the complex molecules of life (in this case, amino acids) could have arisen on our young planet through simple, natural chemical reactions. The experiment was a success in that amino acids, the building blocks of life, were produced during the simulation.

Detailed explanation-3: -Miller Urey excluded Oxygen from the mixture of gases in their experiment as they knew that that Oxygen would make the formation of organic molecules from non organic molecules impossible. There is solid empirical evidence that the Earth’s atmosphere has always had significant levels of Oxygen.

Detailed explanation-4: -So, the correct answer is ‘Glutamic acid’.

Detailed explanation-5: -Miller found a large number of simple organic compounds including some amino acid such as alanine, glycine and aspartic acid.