Final answer:
The question regarding the optimum number of concurrent reads per processor core is not a biology question. The accurate answer to the referenced biology question is that it takes three 'letters' (nucleotides) of an RNA molecule to code for one amino acid.
Step-by-step explanation:
The optimum number of concurrent reads per processor core does not pertain to a Biology question. However, I can answer the biology-related question provided. It takes three 'letters' of an RNA molecule, in sequence, to provide the code for a single amino acid. Therefore, the correct answer to the question from the reference information provided is: