Ribosomes
These are small particles which occur freely in cytoplasm on the outside of the endoplasmic reticulum and in the nucleus.
Chemical Composition:
Ribosomes are made up of almost equal amounts of proteins and ribosomal RNA(rRNA).
Eukaryotic Ribosome are slightly larger than prokaryotic ones.
Number
Ribosomes are present in extremely large amounts in cell.
Functions
Ribosomes carry out the function of protein synthesis.