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Classification and Component Structure

Classification and Component Structure - are brought...

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Classification and Component Structure Ribosomes are composed of 2 subunits a large subunit and a small subunit. Prokaryotic ribosomes differ from eukaryotic ribosomes as shown in Fig. 1 . The ribosomes and ribosomal subunits are described in terms of their approximate rate of sedimentation (in Svedberg units). The higher the mass of the particle the higher the s value and the greater the rate of sedimentation. Function of Ribosomes The ribosome serves as the site of protein synthesis. mRNAs, tRNAs, and amino acids
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Unformatted text preview: are brought together. On the ribosome, the mRNA fits between the two subunits (the interactions are stabilized by interchain hydrogen bonding). The tRNAs occupy a site on the large ribosomal subunit. The ribosome attaches to the mRNA at or near the 5'end. In prokaryotes there is a ribosome binding site near the 5'end of the mRNA. In eukaryotes, the ribosome first attaches at the 5'CAP (7-methyl guanosine). The ribosome then moves along the mRNA in the 5' to 3' direction, one codon at a time....
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