Who discovered that certain types of biological fungal spores prevent bacterial cell wall cross-linking, identifying Penicillin's mechanism? MCQ with Answer and Explanation

Question

Who discovered that certain types of biological fungal spores prevent bacterial cell wall cross-linking, identifying Penicillin's mechanism?

A. Robert Koch

B. Alexander Fleming

C. Louis Pasteur

D. Howard Florey and Ernst Chain

Answer: Option D

Solution (By JKSSB Mock Tests)

While Fleming discovered penicillin, Florey and Chain isolated and purified the molecule for medical treatment, sharing the 1945 Nobel Prize.

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The invention of the common household refrigeration fluid known as Freon (CFC) was developed by which chemist?

A. Roy Plunkett

B. Wallace Carothers

C. Thomas Midgley Jr.

D. Leo Baekeland

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Correct Answer: Option C

Explanation:
Midgley synthesized dichlorodifluoromethane at General Motors in 1928, creating non-toxic, non-flammable cooling gases that later had severe environmental impacts.

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Question #2

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The invention of the common mechanical windshield wiper for automobiles was patented by whom?

A. Stephanie Kwolek

B. Josephine Cochrane

C. Henry Ford

D. Mary Anderson

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Correct Answer: Option D

Explanation:
Mary Anderson patented the manual lever-operated windshield clearing arm in 1903 after watching streetcars struggle in sleet storms.

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Question #3

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Who discovered the phenomenon of specific biological chemical pathways known as carbon fixation or the dark reactions of photosynthesis?

A. Melvin Calvin

B. Hans Krebs

C. Robert Emerson

D. Louis Pasteur

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Correct Answer: Option A

Explanation:
Melvin Calvin traced the pathway of carbon absorption in plants using carbon-14, establishing the Calvin-Benson Cycle.

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