what are ribosomes made of?
Ribosomes are made up of ribosomal RNA (i.e. chains of nucleotides coded for in the cell's DNA) and proteins. A ribosome consists of two subunits, the large subunit and the small subunit, each measured in 'Svedbergs' (S). This unit of measurement relates to the procedures required to separate out different fractions of lysed cell preparations.