Give the historical background of $DNA.$
Give the historical background of $DNA.$
$DNA$ as an acidic substance present in nucleus was first identified by Friedrich Meischer in $1869 .$ He named it as 'Nuclein'.
Due to technical limitation in isolating such a long polymer intact the elucidation of structure of $DNA$ remained elusive for a very long period of time.
It was only in $1953$ that James Watson and Francis Crick, based on the $X$-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin proposed a very simple but famous Double Helix model for the structure of $DNA$.
One of the hallmarks of their proposition was also based on the observation of Erwin Chargaff that for a double stranded $DNA $ the ratio between Adenine and Thymine and Guanine and cytosine are constant and equals one.
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Histones are rich in the basic amino acid ...............and........
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A child receives
A child receives
- [AIPMT 1995]
Distinguish between heterochromatin and euchromatin. Which of the two is transcription-ally active ?
Distinguish between heterochromatin and euchromatin. Which of the two is transcription-ally active ?
$DNA$ was first discovered by
$DNA$ was first discovered by