Who discovered the citric acid cycle (also known as the Krebs cycle) in cellular respiration? MCQ with Answer and Explanation

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Who discovered the citric acid cycle (also known as the Krebs cycle) in cellular respiration?

A. Hans Adolf Krebs

B. Arthur Kornberg

C. Melvin Calvin

D. Louis Pasteur

Answer: Option A

Solution (By JKSSB Mock Tests)

Hans Adolf Krebs discovered the metabolic pathway of energy conversion in cells in 1937, winning the Nobel Prize in 1953.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common household cooking device known as the Microwave Oven was an accidental discovery by whom?

A. Thomas Edison

B. Theodore Maiman

C. Percy Spencer

D. Robert Watson-Watt

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Correct Answer: Option C

Explanation:
Spencer noticed a candy bar melted in his pocket in 1945 while standing near an active military radar magnetron vacuum tube.

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Question #2

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Who discovered that solar light presentation presents distinct missing dark absorptive band lines, establishing the Fraunhofer Lines?

A. Robert Bunsen

B. Gustav Kirchhoff

C. Isaac Newton

D. Joseph von Fraunhofer and William Hyde Wollaston

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Correct Answer: Option D

Explanation:
Wollaston observed early dark bands, and Fraunhofer mapped over 570 lines precisely using customized optical spectroscopes in 1814.

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Question #3

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Who discovered the therapeutic potential of the anti-malarial drug Artemisinin, winning a Nobel Prize in 2015?

A. Ronald Ross

B. Charles Laveran

C. Satoshi Ōmura

D. Tu Youyou

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Correct Answer: Option D

Explanation:
Tu Youyou extracted artemisinin from sweet wormwood plants based on traditional Chinese medical texts, saving millions from malaria.

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