Who discovered the urea cycle, earning a Nobel Prize?

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Multiple Choice

Who discovered the urea cycle, earning a Nobel Prize?

Explanation:
This question tests knowledge of who described the urea cycle and later earned a Nobel Prize for work in metabolism. Hans Krebs, working with Kurt Henseleit, described the urea cycle in the liver, showing how ammonia is converted to urea for excretion and thereby revealing a key pathway for nitrogen disposal in mammals. This discovery solidified Krebs’s reputation as a major figure in biochemistry, and he was awarded the Nobel Prize in Physiology or Medicine in 1953 for his broader work on metabolic cycles, including the citric acid cycle. The other scientists listed made important contributions in different areas—Pasteur in microbiology and fermentation, Hooke as an early observer of cells, Warburg in cancer metabolism—so they did not discover the urea cycle.

This question tests knowledge of who described the urea cycle and later earned a Nobel Prize for work in metabolism. Hans Krebs, working with Kurt Henseleit, described the urea cycle in the liver, showing how ammonia is converted to urea for excretion and thereby revealing a key pathway for nitrogen disposal in mammals. This discovery solidified Krebs’s reputation as a major figure in biochemistry, and he was awarded the Nobel Prize in Physiology or Medicine in 1953 for his broader work on metabolic cycles, including the citric acid cycle. The other scientists listed made important contributions in different areas—Pasteur in microbiology and fermentation, Hooke as an early observer of cells, Warburg in cancer metabolism—so they did not discover the urea cycle.

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