This question seems to be referencing the ribosomal subunits in cellular biology, particularly in the context of prokaryotes and eukaryotes. In biology, ribosomes are made up of two subunits, with eukaryotic ribosomes having a ’70s’ type, which is actually a combination of 60s and 40s subunits, while prokaryotic ribosomes are classified as ’70s’ as well, consisting of 50s and 30s subunits.
The confusion arises because although we mention ’70s’ and ’80s’, the context lies in how we categorize and name these ribosomal subunits. Neither prokaryotic nor eukaryotic ribosomes are classified as ’80s’ for their subunit makeup. The ’80s’ ribosomal classification refers specifically to eukaryotic ribosomes, which consist of a 60s and 40s subunit.
Thus, if we are talking about ’50s’ and ’30s’, we are indeed in prokaryotic territory where these values refer to the specific sizes (in Svedberg units) of the ribosomal subunits that make up the ’70s ribosomes. So, in this context, the answer lies within the naming conventions used in biology to classify ribosomal sizes and their associated structures.