Structure of DNA in a Prokaryotic Cell

• Deoxyribonucleic acid (DNA) is a molecule that contains genetic information.
• DNA molecules have two nucleotide strands that wind around one another to form double helix structure.
• Each nucleotide strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups.
• Attached to each sugar is one of four nitrogenous bases: adenine (A), cytosine (C), guanine (G), and thymine (T)
• These bases occur in pairs, where in Adenine is always bonded to Thymine with a 2-H bonds and Cytosine bonded to Guanine with 3-H bonds.
• Prokaryotic cells do not have a defined nucleus hence the DNA is tightly coiled in the cytoplasm.

Figure: DNA double helix structure

Resources

• GLI Training package on LPA 2012​

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