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MCAT Question A Day - 10/11/14 - Answer!

What do the results of the Urey-Miller experiment demonstrate?

A.  the existence of life on earth
B.  that small biological molecules cannot be synthesized from inorganic material
C.  that life may have evolved from inorganic precursors
D.  that humans have evolved from photosynthetic cyanobacteria

C is correct. Urey and Miller demonstrated that organic molecules may be created from inorganic molecules under the primordial earth conditions. Urey-Miller did not prove the existence of life on earth, (you do), nor did they prove that humans have evolved from bacteria, photosynthetic or not.

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