Structure of DNA
DNA is the chemical that determines inherited characteristics and it contains vast amounts of information in the form of genetic code.
A nucleotide (monomer) is made up of 3 basic components:
- deoxyribose sugar
- a phosphate group
- organic base, belonging to 1 of 2 groups
- single ring bases- cytosine (C) and thymine (T)
- double ring bases- adenine (A) and guanine (G)
These 3 basic components are compined through condensation reactions; this creates a single nucleotide (mononucleotide)
2 mononnucleotides may be combined as a result of a condensation reaction between the deoxyribose sugar of 1 and the phosphate of the other. This creaates a dinucleotide.
Repeated condesation reactions like this forms a long chain of mononucleotides known as a polynucleotide.
The DNA structure was worked out by Francis Crick and James Watson in 1953, who were followig the work of Rosalind Franklin on the X-ray diffraction patterns of DNA.
DNA is made up…