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- Question
What two scientists established the structure of dna?
Options- A. Rosalind Franklin and Maurice Wilkins
- B. James Watson and Francis Crick
- C. Rosalind Franklin and Francis Crick
- D. James Watson and Maurice Wilkins
- Correct Answer
- James Watson and Francis Crick
ExplanationIn the early 1950s two scientists, Rosalind Franklin and Maurice Wilkins, studied DNA using x-rays. Franklin produced an x-ray photograph that allowed two other researchers, James Watson and Francis Crick to work out the 3D structure of DNA. The structure of DNA was found to be a double helix.
- 1. Who Invented Modern Frequency Modulation FM Radio ?
Options- A. Peter Durand
- B. Percy Shaw
- C. Edwin H. Armstrong
- D. Leo Hendrik Baekeland Discuss
- 2. Who Invented Traffic Signal ?
Options- A. Lewis Edson Waterman
- B. Levi Strauss
- C. Percy LeBaron Spencer
- D. Garrett Augustus Morgan Discuss
- 3. Who Invented The World Wide Web ?
Options- A. Sir Timothy John
- B. Earle Dickson
- C. James Rineose
- D. Laszlo Jozsef Biro Discuss
- 4. Lift was invented by
Options- A. Otis
- B. Domagk
- C. Lee De Forest
- D. None of these Discuss
- 5. Telegrahic code was introduced by
Options- A. Lipman
- B. Macmillan
- C. Thomas Moore
- D. Cockrell Discuss
- 6. The cotton gin was an important invention because Discuss
- 7. Which famous scientist unknowingly founded the field of spectroscopy?
Options- A. Issac Newton
- B. Galileo
- C. Graham Bell
- D. None of the above Discuss
- 8. Which is an invention that improved safety for railway passengers?
Options- A. Air brakes
- B. Refrigerated rail cars
- C. Time standardization
- D. Pullman sleeping cars Discuss
- 9. In which country the hormone gibberellin was discovered?
Options- A. India
- B. Japan
- C. China
- D. Russia Discuss
- 10. What did Sir William Herschel discover in 1800?
Options- A. Ultraviolet rays
- B. Infra-red radiation
- C. X rays
- D. Microwaves Discuss
Inventions problems
Search Results
Correct Answer: Edwin H. Armstrong
Correct Answer: Garrett Augustus Morgan
Correct Answer: Sir Timothy John
Correct Answer: Otis
Correct Answer: Thomas Moore
Correct Answer: Cotton Gin was invented by Eli Whitney in 1793, which is used to separate cotton seeds from cotton fiber Hence, it was an important invention because it dramatically reduced the amount of time it took to separate cotton seeds from cotton fiber
Correct Answer: Issac Newton
Correct Answer: Air brakes
Explanation:
An invention that improved safety for railway passengers is Air brakes. With the use of air brakes using compressed air, become more effective by preventing many train accidents.
Correct Answer: Japan
Explanation:
The hormone gibberellin was discovered in the country Japan.
Correct Answer: Infra-red radiation
Explanation:
Sir William Herschel discovered Infra-red radiation in 1800.
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