Ribosomes work on proteins. They read instructions on how to build proteins from the DNA. They are made of rRNA and proteins. They occur in two places: free in the cytoplasm or attatched to the rough E.R. The ribosomes can alternate positions between the two. The proteins made in the free ribosomes only function within the cytoplasm. The bound ribosomes usually make proteins that go into membranes, usually for packaging within certain organelles.
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