So ribosomes are composed of proteins as well as rRNA. And the final type of RNA molecule that we should be aware of is transfer RNA or tRNA. So tRNA is also synthesized in the nucleus and the function of tRNA is to basically collect and bring the proper amino acids from the cytoplasm and into the ribosomes. So the ribosomes can use those amino acids to synthesize the polypeptide chain. Now, before we actually examine the process of translation let's discuss what ribosomes actually are and what they consist of. So translation or the process of protein synthesis basically involves these special cell machineries known as ribosomes.