Gradually, a complete listing of the genetic code codons was developed. Image from Purves et al. The genetic code consists of 61 amino-acid coding codons and three termination codons, which stop the process of translation. The genetic code. Image from Purves et al.
Terminators are the stop signals.
The length of rRNA differs in each. The 30S unit has 16S rRNA and 21 different proteins. The 50S subunit consists of 5S and 23S rRNA and 34 different proteins. Subunits of a ribosome. Image from Purves et al.