Who discovered the biological mechanism of vector cloning known as Polymerase Chain Reaction (PCR)? MCQ with Answer and Explanation

Who discovered the biological mechanism of vector cloning known as Polymerase Chain Reaction (PCR)?

A. James Watson

B. Alec Jeffreys

C. Francis Crick

D. Kary Mullis

Answer: Option D

Kary Mullis conceived the thermal cycling enzyme replication process to rapidly amplify specific DNA strands in 1983.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1 Report Error

Who invented the slide rule, an analog computing tool used extensively before electronic calculators?

A. Blaise Pascal

B. John Napier

C. William Oughtred

D. Gottfried Leibniz

Correct Answer: Option C

Explanation:
William Oughtred invented the circular and rectilinear slide rule in the 1620s based on John Napier's logarithms.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2 Report Error

Who invented the modern air conditioning system to control indoor temperature and humidity levels in 1902?

A. Benjamin Franklin

B. James Dewar

C. Willis Carrier

D. Nikola Tesla

Correct Answer: Option C

Explanation:
Willis Carrier designed the first mechanical air conditioning apparatus to solve humidity problems inside a printing plant.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3 Report Error

Who discovered that electric fields can split light spectral lines, a physical phenomenon known as the Stark Effect?

A. Hendrik Lorentz

B. Pieter Zeeman

C. Johannes Stark

D. Max Planck

Correct Answer: Option C

Explanation:
Johannes Stark discovered the electric splitting of hydrogen spectral lines in 1913, winning the 1919 Nobel Prize in Physics.

This question belongs to: Static General Knowledge Inventions and Discoveries