How can four types of DNA nucleotides code for twenty different amino acid types?
a. Purines and pyrimidines form tRNA codes for each specific amino acid b. Combinations of two purines and pyrimidines form codes for specific amino acids c. Combination of two purines and pyrimidines form twenty codes for amino acids d. Combinations of three of the four DNA nucleotide types can form sixty-four codes e. Each purine and pyrimidine form a code for a specific amino acid

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