Who discovered that the genetic molecule DNA can transition between stable 'A' and 'B' structural forms depending on relative humidity levels? MCQ with Answer and Explanation

Question

Who discovered that the genetic molecule DNA can transition between stable 'A' and 'B' structural forms depending on relative humidity levels?

A. James Watson

B. Maurice Wilkins

C. Francis Crick

D. Rosalind Franklin

Answer: Option D

Solution (By JKSSB Mock Tests)

Franklin's meticulous control of humidity during X-ray diffraction isolation yielded the highly detailed 'B-form' structural patterns.

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Who is the inventor of the Richter Scale used to measure the magnitude of earthquakes?

A. Giuseppe Mercalli

B. Alfred Wegener

C. Charles Richter

D. James Hutton

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Correct Answer: Option C

Explanation:
Charles F. Richter developed the Richter magnitude scale in 1935 in partnership with Beno Gutenberg.

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Question #2

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Who discovered that electrical currents passing through solutions break down compounds chemically, formalizing the Laws of Electrolysis?

A. Alessandro Volta

B. Svante Arrhenius

C. Humphry Davy

D. Michael Faraday

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Correct Answer: Option D

Explanation:
Michael Faraday established the quantitative laws of electrolysis, introducing terms like anode, cathode, and ion.

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Question #3

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The discovery of the cellular structure of nervous tissue using a specialized silver staining technique was developed by whom?

A. Theodor Schwann

B. Santiago Ramón y Cajal and Camillo Golgi

C. Robert Hooke

D. Louis Pasteur

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Correct Answer: Option B

Explanation:
Ramón y Cajal used Golgi's staining method to prove that neurons are separate individual cells, sharing the 1906 Nobel Prize.

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