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| Modern Genetic Analysis Chapter 3. Gene Function Translation Figure 3-21. Ribosomes contain a large and a small subunit. Each subunit contains both rRNA of varying lengths and a set of proteins (designated by different colors). There are two principal rRNA molecules in all ribosomes. Ribosomes from prokaryotes also contain one 120-base-long rRNA that sediments at 5S, whereas eukaryotic ribosomes have two small rRNAs: a 5S RNA molecule similar to the prokaryotic 5S, and a 5.8S molecule 160 bases long. The large subunit proteins are named L1, L2, etc., and the small subunit proteins S1, S2, etc. (From H. Lodish, D. Baltimore, A. Berk, S. L. Zipursky, P. Matsudaira, and J. Darnell, Molecular Cell Biology, 3d ed. Copyright © 1995 by Scientific American Books, Inc.)

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