The mission of chemistry

the codon information is sufficient to choose a particular amino add from 20 possibles. 

If nature designed the two-base codons, then such a codon would contain only codon2 = log2( - ) = 4 bits, which would be insufficient to code the amino acid. 

the protein coding that uses the information from the DNA sequence, takes place with the information excess of 6 - 4.23 = 1.77 bits per amino add. 

There is an impression that chemistry in biology is only a kind of substitute, a pretext, no more than a material carrier of the mission of the whole organism. Tfext-books of biochemistry do not say much about chemistry, they talk about molecular functions to perform, in a sense about metachemistry. A particular molecule seems not to be so important. What counts is its function. A good example are enzymes. One type of enzyme may perform the same or similar functions in many different organisms (from fungi to man). The function is the same, but the composition of the enzyme changes from species to species two species may differ by as much as 70% of the amino acids. However, those amino adds that are crucial for the enzyme function are preserved in all species. 

We may perceive chemistry as a potential medium for information processing. This unbelievable chemical task would be collecting, transporting, changing, dispatching and transferring of information. 

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Cbemistry has played, and continues to play, a prominent role in human civilization. If you douht it, just touch any surface around you no matter what it is, it probably represents a product of the chemical industry. Pharmaceutical chemistry may be seen as a real bmelactor, for it makes our lives longer and more comfortable. Is it the case, therefore, that the mission of chemistry is the production of better dyes, polymers, semiconductors, and drugs No. its tnie mission is much more exciting. 

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