Ribosomal RNA - builds together with the protein subunits the Ribosome. It is the most predominant material of the ribosome, approximately 60% of the weight are made of rRNA and 40% of proteins.

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What do cells do when they aren't creating proteins?

I've always thought that the majority of the "work" in a cell is protein production, until I read the following. The Wikipedia article on the central dogma of molecular biology states this: 80% ...
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How to build S16 rRNAs phylogenetic trees?

Here is what I know so far: Multiple copies are present in prokaryotes, but according to a paper by Lukjancenko el al.[1] it is enough to select the most similar ones. There are stem regions in the ...