DNA consists of a long chain of ____ linked together. The base thymine pairs with the base ____. A gene is a sequence of ____ on DNA that codes for the sequence of amino acids in a protein. ____ bases on DNA codes for one amino acid in a protein. Protein synthesis takes place at a ____. There are ____ different amino acids in the proteins of living organisms. The correct amino acids are brought together to the ribosomes in the correct order by ____ molecules. ____ are proteins that act as biological catalysts. A ____ is a random change in the base sequence of a gene. A ____ is the entire set of genetic material in an organism.

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