Here's why:
* Ribosomes are essential for protein synthesis. All living organisms need proteins to function, and ribosomes are the cellular machinery that reads genetic instructions (from mRNA) and builds proteins from amino acids.
* They are found in all domains of life. This includes bacteria (prokaryotes), and all the eukaryotes like fungi, protists, plants, and animals.
However, there are some differences in ribosomes across these groups:
* Prokaryotic ribosomes are smaller than eukaryotic ribosomes (70S vs 80S).
* The specific proteins and ribosomal RNA molecules that make up the ribosomes can vary slightly between different groups.
But, the fundamental function of ribosomes in protein synthesis remains the same across all life forms.
