Who discovered that certain types of mold produce enzymes that slice viral genetic strains, known as CRISPR-Cas9 genome editing? MCQ with Answer and Explanation

Question

Who discovered that certain types of mold produce enzymes that slice viral genetic strains, known as CRISPR-Cas9 genome editing?

A. James Watson

B. Emmanuelle Charpentier and Jennifer Doudna

C. Alec Jeffreys

D. Kary Mullis

Answer: Option B

Solution (By JKSSB Mock Tests)

Charpentier and Doudna adapted the bacterial immune mechanism into an exceptionally precise genetic engineering tool, winning the 2020 Nobel Prize.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who invented the high-pressure industrial chemical synthesis of ammonia from raw nitrogen and hydrogen gases?

A. Wilhelm Ostwald

B. Dmitri Mendeleev

C. Antoine Lavoisier

D. Fritz Haber and Carl Bosch

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Correct Answer: Option D

Explanation:
The Haber-Bosch process synthesized ammonia efficiently on an industrial scale, revolutionizing agricultural fertilizers.

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Question #2

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The invention of the common electronic LED (Light Emitting Diode) operating in the visible light spectrum was developed by whom?

A. Nick Holonyak

B. Thomas Edison

C. Theodore Maiman

D. Shuji Nakamura

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Correct Answer: Option A

Explanation:
Nick Holonyak invented the first practical visible-spectrum (red) light-emitting diode in 1962 while working at General Electric.

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Question #3

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Who discovered that regular arrays of atoms act as diffraction gratings for X-rays, establishing X-ray crystallography?

A. Max von Laue

B. Rosalind Franklin

C. William Henry Bragg

D. Wilhelm Röntgen

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Correct Answer: Option A

Explanation:
Max von Laue discovered X-ray diffraction by crystals in 1912, proving the wave nature of X-rays and structural lattice layouts.

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