are large, complex molecular machines found within all living cells
that serve as the primary site of biological protein synthesis.
Ribosomes link amino acids together in the order determined by
messenger RNA molecules. Ribosomes consist of two major subunits.
The small ribosomal subunit reads the RNA while the large subunit
joins amino acids to form a polypeptide chain. Ribosomes are found
in both prokaryotes and eukaryotes. They are made of proteins and
three or four RNA molecules called subunits. Ribosomes can bind to
and RNA chain and use it as a template for determining the correct
sequence of amino acids in a particular protein. When the cell needs
to make proteins you look for ribosomes because they are the protein
builders or the proteins synthesizers of the cell. They connect one
amino acid at a time and build long chains. Ribosomes are found in
many places around the cell. They float inside the cytoplasm and
others are found on the endoplasmic reticulum.
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