Who discovered the primary biological pattern detailing that DNA nucleotide bases match in specific pairs ($A=T, G=C$)? MCQ with Answer and Explanation

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Who discovered the primary biological pattern detailing that DNA nucleotide bases match in specific pairs ($A=T, G=C$)?

A. James Watson

B. Erwin Chargaff

C. Rosalind Franklin

D. Francis Crick

Answer: Option B

Solution (By JKSSB Mock Tests)

Chargaff's Rules established the 1:1 stoichiometric ratios of purines to pyrimidines, providing a key clue for Watson and Crick's model.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that blood can be categorized into various Rh factors (positive and negative)?

A. Edward Jenner

B. Robert Koch

C. William Harvey

D. Karl Landsteiner and Alexander Wiener

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Correct Answer: Option D

Explanation:
Karl Landsteiner and Alexander S. Wiener discovered the Rhesus (Rh) factor in blood in 1937.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered that the chemical element Boron is isolated by reacting boric acid with potassium metal?

A. Humphry Davy

B. Jöns Jacob Berzelius

C. Joseph Louis Gay-Lussac and Louis Jacques Thénard

D. Antoine Lavoisier

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Correct Answer: Option C

Explanation:
Gay-Lussac and Thénard independently isolated elemental boron in 1808, around the same time as Sir Humphry Davy.

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Question #3

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Who invented the first operational stethoscope in 1816?

A. Louis Pasteur

B. Edward Jenner

C. René Laennec

D. Joseph Lister

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Correct Answer: Option C

Explanation:
René Laennec invented the acoustic stethoscope because he felt uncomfortable placing his ear directly on female patients' chests.

This question belongs to: Static General Knowledge Inventions and Discoveries

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