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. Maurice Wilkins

B. James Watson

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.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The invention of the common computing operating system layout known as Unix was co-developed by whom?

A. Steve Jobs

B. Ken Thompson and Dennis Ritchie

C. Linus Torvalds

D. Bill Gates

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Correct Answer: Option B

Explanation:
Thompson and Ritchie engineered Unix at Bell Labs in 1969, establishing foundational standards for multitasking operating systems.

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Question #2

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The Hovercraft was invented by which British engineer?

A. James Dyson

B. John Logie Baird

C. Christopher Cockerell

D. Frank Whittle

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Correct Answer: Option C

Explanation:
Sir Christopher Cockerell invented the hovercraft (amphibious craft supported by a cushion of air) in 1956.

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Question #3

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Who discovered the protozoan parasite causing Malaria in human red blood cells?

A. Charles Alphonse Laveran

B. Louis Pasteur

C. Robert Koch

D. Ronald Ross

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Correct Answer: Option A

Explanation:
Charles Alphonse Laveran discovered the malaria parasite in 1880, winning the Nobel Prize in 1907. Sir Ronald Ross later discovered that mosquitoes transmit it.

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