Who discovered the first recognized hormonal messenger molecule in the human body, Secretin? MCQ with Answer and Explanation

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Who discovered the first recognized hormonal messenger molecule in the human body, Secretin?

A. William Bayliss and Ernest Starling

B. Karl Landsteiner

C. Frederick Banting

D. Charles Best

Answer: Option A

Solution (By JKSSB Mock Tests)

Bayliss and Starling isolated secretin in 1902, discovering chemical signaling loops that function independently of direct nervous inputs.

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 mechanical cash register to prevent employee theft was patented by whom in 1879?

A. James Ritty

B. Elisha Otis

C. Christopher Sholes

D. Walter Hunt

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Correct Answer: Option A

Explanation:
Saloon owner James Ritty designed 'Ritty's Incorruptible Cashier' after observing the revolutions of a ship's propeller tracker.

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Question #2

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Who discovered ultraviolet radiation in 1801, shortly after Herschel's discovery of infrared?

A. Johann Wilhelm Ritter

B. Heinrich Hertz

C. William Herschel

D. Wilhelm Röntgen

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Correct Answer: Option A

Explanation:
Johann Wilhelm Ritter discovered 'chemical rays' (ultraviolet light) by observing how silver chloride reacted to invisible rays past the violet spectrum.

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Question #3

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Who discovered the law of electromagnetic induction in 1831?

A. Heinrich Hertz

B. James Clerk Maxwell

C. Michael Faraday

D. Hans Christian Ørsted

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Correct Answer: Option C

Explanation:
Michael Faraday discovered electromagnetic induction, leading to the development of electric generators and transformers.

This question belongs to: Static General Knowledge Inventions and Discoveries

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