The Miller-Urey experiment combined which two things to create basic building blocks of life?

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BlackTom AI · Accepted Answer

The question asks: The Miller-Urey experiment combined which two things to create basic building blocks of life?

Because the answer options are not provided, I will first acknowledge the given answer and then explain the underlying concept.

What the experiment did: The Miller-Urey experiment simulated early Earth conditions by combining simple inorganic molecules (the basic inorganic feedstock such as water, methane, ammonia, and hydrogen) with an energy source to drive chemical reactions. The energy source used in the classic setup was electrical discharges (sparks) to mimic lightning.

Why the stated answer is correct: The combination of simple molecules (a basic organic/inorganic starting mix) with electricity (energy) is precisely what allowed complex organic molecules, such as amino acids, to form in the experiment. In other words, the experiment demonstrated that under reducing atmospheric conditions and with an energy input, simple molecules can be driven to form biologically important organic compounds.

Why other potential options (if they had been provided) might be incorrect:
- If an option claimed only 'electricity' or only 'simple molecules' were sufficient without both, that would be incomplete, because energy input is needed to drive the chemical reactions among the simple molecules to synthesize more complex organics.
- If an option suggested exotic or non-starting materials (e.g., 'complex biomolecules already present' or 'radioactive sources'), those would misrepresent the historical setup and purpose of the experiment.
- If an option framed the process as requiring biological catalysts or enzymes, that would be inaccurate for the Miller-Urey design, which relied on abiotic chemistry without enzymes.

In summary, the core idea is the synergy between a mixture of simple starting molecules and an energy source to trigger the synthesis of more complex organic compounds, which is consistent with the correct interpretation of the Miller-Urey experiment.

Biology 2 - Ecology (Adv) Quiz 5: History of Life Quiz (classic)

The Miller-Urey experiment combined which two things to create basic building blocks of life?

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