How many membranes do ribosomes have?

Question

How many membranes do ribosomes have?

Answer 1

ribosomes are membraneless

Answer 2

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. The 40S subunit has a 1900 nucleotide (18S) RNA and ~33 proteins

Answer 3

None, they are little clumps of protein and RNA; they have no lipid bilayer.