Exceptions to the Rule: Organelles with Their Own DNA While the nucleus houses the majority of genetic material, it is not the only place where DNA exists in a eukaryotic cell. Plasmids: Extra Genetic Elements Beyond the main chromosome, many bacteria also contain smaller, circular pieces of DNA called plasmids.
Plasmids DNA in Bacteria: Where Extra Genetic Material Is Found
The Scenario in Prokaryotes Prokaryotes, which include bacteria and archaea, are structurally simpler organisms that lack a nucleus and other membrane-bound organelles. Instead, it is tightly wound around proteins called histones, forming a substance known as chromatin.
Every living organism, from the simplest bacterium to the most complex mammal, relies on a fundamental instruction manual encoded within its cells. Chloroplasts: Found only in plant and algal cells, these organelles perform photosynthesis.
Plasmids: The Circular DNA Found in Bacteria
The nuclear envelope protects the genetic material from damage in the busy environment of the cell cytoplasm. Mitochondria: Often called the powerhouses of the cell, these structures generate energy.
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