Organization of Prokaryotic DNA:
- Found in the nucleoid region.
- Prokaryotes generally have a small, circular DNA.
- There is a single origin of replication.
- Less elaborately structured and folded genome.
- The genome size ranges in between 10^4 to 10^7 bp with a high gene density.
- They are polycistronic i.e., multiple genes are transcribed through the same promoter.
- A single RNA Polymerase is involved in transcription.
- Multiple proteins act together to fold and condense prokaryotic DNA. Folded DNA is then organized into a variety of conformations that are supercoiled and wound around tetramers of the HU proteins.
Organization of Eukaryotic DNA:
- Found in the nucleus.
- They have multiple linear chromosomes (2 to <50.
- The chromosomes have multiple origin of replication sites.
- Complexed genome with a large amount of protein to form chromatin.
- The genome size ranges from10^8 to 10^11 bp with a low gene density due to the presence of introns.
- They are monocistronic i.e., one gene is under the control of one promoter.
- Three type of RNA Polymerase are present of which RNA Pol II is involved in transcription.
- Eukaryotes wraps their DNA around proteins called histones .
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