Which of the Following Was a Limitation of the Miller-Urey

question 50

Multiple Choice

Which of the following was a limitation of the Miller-Urey experiment in the 1950s?

• A) The experiment synthesized both D- and L-isomers of amino acids, but the amino acids in living things are always L-isomers.
• B) The experimenters assumed that Earth's early atmosphere contained only hydrogen gas, methane, ammonia, and water vapor; however, evidence uncovered more recently suggests that Earth's early atmosphere contained many more components.
• C) DNA is not self-catalytic.
• D) In living organisms today, peptide linkages are catalyzed by ribozymes.
• E) The hot temperatures of the experiments denatured some of the proteins that were synthesized.