Prokaryotic Ribosomes
Prokaryotic cells, such as bacteria, contain ribosomes that are different from those found in eukaryotic cells. The ribosomes in prokaryotes are known as 70S ribosomes.

70S Type Ribosomes
- Prokaryotic ribosomes are composed of two subunits: a 30S small subunit and a 50S large subunit, which combine to form a 70S ribosome.
- The 30S subunit consists of a 16S ribosomal RNA (rRNA) molecule and several proteins, while the 50S subunit consists of a 23S rRNA, a 5S rRNA, and additional proteins.
- The 70S ribosome is responsible for protein synthesis in prokaryotic cells, as it reads the messenger RNA (mRNA) and helps in the assembly of amino acids to form proteins.

Functional Differences
- The 70S ribosomes in prokaryotes are smaller in size compared to the 80S ribosomes found in eukaryotic cells.
- The differences in ribosome structure between prokaryotes and eukaryotes are exploited by antibiotics that specifically target bacterial ribosomes, leading to selective inhibition of protein synthesis in bacteria without affecting eukaryotic cells.
In conclusion, the type of ribosomes found in prokaryotes is the 70S type, which consists of a 30S small subunit and a 50S large subunit that combine to form the functional 70S ribosome responsible for protein synthesis in prokaryotic cells.