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What are 70S ribosomes?

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70s Ribosomes- Present in Prokaryotes (bacterium), mitochondria and chloroplast. It consists of 2 subunits- 50S and 30S. They are composed of 60% RNA and 40% proteins. The 50S subunit contains two rRNAs (23S and 5S) complexed with ~34 proteins. The 30S subunit contains 16S rRNAs complexed with ~21 proteins. read more

The ribosomes found in chloroplasts and mitochondria of eukaryotes also consist of large and small subunits bound together with proteins into one 70S particle. These organelles are believed to be descendants of bacteria (see Endosymbiotic theory) and, as such, their ribosomes are similar to those of bacteria. read more

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