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ribosomes. consists of 2 subunits-made of rna and protein function-site of protein synthesis a cell organelle that functions as the site of protein synthesis inthe cytoplasm. its rna components are constructed in the nucleolus.onsists of 2 subunits-made of rna and protein function-site of protein synthesis a cell organelle that functions as the site of protein synthesis inthe cytoplasm. its rna components are constructed in the nucleolus.
1 In the cytoplasm, the two subunits of ribosomes are bound around the polymers of mRNA; proteins are then synthesized with the help of transfer RNA. 2  The proteins that are synthesized by the ribosomes present in the cytoplasm are used in the cytoplasm itself.lant cell do have ribosomes and they are composed of proteins and ribosomal RNA. The ribosomes in a plant cell are found in the cytoplasm, the surface of the rough e ndoplasmic reticulum, the mitochondria and on chloroplasts. There are two types of ribosomes-free ribsomes and attached ribosomes.