Differences between prokaryotic and eukaryotic gene expression?

Prokaryotes have a single circular chromosome, wherease eukaryotes have many bar shaped chromsomes. Also, prokaryotes are single cell organisms (there are some single cell eukaryotes, but never multicellular prokaryotes). Because multicellular organisms have so many cells, (such as humans), their chromsomes have to contain a lot of information to provide details to the cell so it can carry out it's job In eukaryotic cell DNA there are introns and exons.

When a gene is needed to be expressed, the cell must remove the information in the sequence that is not needed; ie, the introns. It is believed that the same DNA sequence can actually code for more than one gene because of the cells ability to remove introns and keep exons. For example, the word 'strawberry' contains the code for three words: straw, berry, strawberry.By removing peices of the word, you are left with information that provides a different set of instructions.

Prokaryotes do not have introns and exons.

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