iGen 06-13b

Structure of eukaryotic ribosomes

Ribosome subunits comprise one or two rRNA molecules, plus a variable number of proteins. Combinations of rRNAs and proteins typically have a smaller sedimentation rate (S) than their component parts, due to condensation. In eukaryotes, the complete 80S monosome comprises a 40S Small Subunit (SSU) that includes the 18S rRNA, and a 60S Large Subunit (LSU) that includes the 28S and 5S rRNAs.

Figure © 2010 PJ Russell, iGenetics 3rd ed.; all text material © 2011 by Steven M. Carr