Who discovered the biological mechanism of continuous cell culturing, establishing the immortal 'HeLa cell line' in 1951? MCQ with Answer and Explanation

Question

Who discovered the biological mechanism of continuous cell culturing, establishing the immortal 'HeLa cell line' in 1951?

A. George Otto Gey

B. Robert Koch

C. Jonas Salk

D. Alexander Fleming

Answer: Option A

Solution (By JKSSB Mock Tests)

George Gey isolated and successfully cultivated cervical cancer tissue cells from Henrietta Lacks without them dying out in laboratory vessels.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered the phenomenon of radioactivity in 1896?

A. Wilhelm Röntgen

B. Henri Becquerel

C. Ernest Rutherford

D. Marie Curie

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Correct Answer: Option B

Explanation:
Henri Becquerel discovered radioactivity in 1896 while working with uranium salts, for which he shared the 1903 Nobel Prize in Physics.

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Question #2

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Who discovered the mathematical value and formula for the Universal Gravitational Constant ($G$) using a torsion balance?

A. Isaac Newton

B. Albert Einstein

C. Henry Cavendish

D. Robert Hooke

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Correct Answer: Option C

Explanation:
Henry Cavendish measured the density of the Earth and effectively calculated the value of the gravitational constant $G$ in 1798.

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Question #3

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Alexander Fleming discovered penicillin, the world's first effective antibiotic, in which year?

A. 1935

B. 1942

C. 1918

D. 1928

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Correct Answer: Option D

Explanation:
Sir Alexander Fleming discovered penicillin in 1928 at St. Mary's Hospital, London, after noticing a mold contaminating a petridish of staphylococci.

This question belongs to: Static General Knowledge Inventions and Discoveries

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