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How many membranes do ribosomes have?

April 26, 2017answer Biology Mathematics Membranes ribosomes

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How many membranes do ribosomes have?

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Made of protein and RNA. No membranes at all. The ribosomal subunits of bacterias and eukaryotes are quite similar. Bacteria have 70S ribosomes, each consisting of a small (30S) and a large (50S) subunit. Their large subunit is composed of a 5S RNA subunit (consisting of 120 nucleotides), a 23S RNA subunit (2900 nucleotides) and 34 proteins. The 30S subunit has a 1540 nucleotide RNA subunit (16S) bound to 21 proteins. Eukaryotes have 80S ribosomes, each consisting of a small (40S) and large (60S) subunit. Their large subunit is composed of a 5S RNA (120 nucleotides), a 28S RNA (4700 nucleotides), a 5.8S subunit (160 nucleotides) and ~49 proteins.