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Monerans originated from the first type of life, progenote. Progenotes are prokaryotes (unicellular beings with a nucleus stuck together with membrane) based off RNA instead of the many organisms that have DNA. On that note, monerans are a kingdom of prokaryotes which includes living organisms like bacteria, mycoplasma, and cyanobacteria. More of this will be covered in the next section. They are the most primitive example of a living organism. Because they are so versatile, they may almost live anywhere, from the arctic cold, to the desert sands.In fact, a single drop of water, around .75 ml, may have up to 60 MILLION bacteria cells. And, as you may imagine, they are by far the most abundant of ALL organisms. As well, the cells resemble each other in outer shape and form. They are unicellular, and have no specific way of nutrition. They can be aerobic or anaerobic in. There are cell wall present, and they are made of peptidoglycan (which is just simply polymer made up of amino acids and sugars, thus forming a layer outside the membrane; which is the cell wall) with mucin covering. They have naked DNA. No membrane bound organelles are inside the monerans. Finally, they multiply by binary fission.
The kingdom is divided into two groups: Archaebacteria – the ancient type and Eubacteria – the true type. The true type is further divided into bacteria and cyanobacteria. |