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Q.

In what year was DNA discovered??:))

Tags: year, dna
Asked by sumita ganguly, 02 Nov '07 10:32 pm
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Answers (5)

1.

DNA was first isolated by the Swiss physician Friedrich Miescher who, in 1869, discovered a microscopic substance in the pus of discarded surgical bandages. As it resided in the nuclei of cells, he called it "nuclein".[127] In 1929 this discovery was followed by Phoebus Levene's identification of the base, sugar and phosphate nucleotide unit.[128] Levene suggested that DNA consisted of a string of nucleotide units linked together through the phosphate groups. However, Levene thought the chain was short and the bases repeated in a fixed order. In 1937 William Astbury produced the first X-ray diffraction patterns that showed that DNA had a regular structure.[129]

In 1943, Oswald Theodore Avery discovered that traits of the "smooth" form of the Pneumococcus could be transferred to the "rough" form of the same bacteria by mixing killed "smooth" bacteria with the live "rough" form. Avery identified DNA as this transforming principle.[130] DNA's role in heredity was confirmed in 1953, whe ...more
Answered by jameel ahmed, 02 Nov '07 10:39 pm

 
  
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2.

In 1953
Answered by himanshu sharma, 02 Nov '07 10:37 pm

 
  
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3.

What typing all the questions from the Manorama Year Book ?
Answered by Yuvraj Dubey, 02 Nov '07 10:35 pm

 
  
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4.

In 1868 a swiss scientist, friedrich mieshcer discoverd dna n named it as nuclein nd later it was discovered by watson n crick.................
Answered by sapna sharma, 12 Feb '09 06:58 pm

 
  
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5.

1869
Answered by Saj Sierra, 08 Nov '07 02:18 pm

 
  
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Francis Crick, James D. Watson and Maurice Wilkins won a Nobel prize for the discovery of the helical structure of the DNA.Rosalind Franklin, a collea..more

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