MCAT Biology : Evidence of Evolution

Study concepts, example questions & explanations for MCAT Biology

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Example Questions

Example Question #11 : Evolution

The Urey-Miller experiment determined which of the following results?

Possible Answers:

The early atmosphere was composed of ammonia and methane

Cyanobacteria were responsible for the oxygenation of the atmosphere

Organic molecules can arise from inorganic precursors

DNA replicates via semiconservative replication

Correct answer:

Organic molecules can arise from inorganic precursors

Explanation:

The Urey-Miller experiment was used to determine if the early atmospheric conditions were favorable for the creation of organic materials. Their experiments determined that basic organic molecules, such as urea and amino acids, were able to form in early atmospheric conditions.

The Mehselson-Stahl experiment revealed the semi-conservative nature of DNA replication.

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