It has been suggested that the present-day triplet genetic codeevolved from a doublet code when there were fewer amino acidsavailable for primitive protein synthesis. As determined by comparisons of ancient and recently evolved proteins, cysteine, tyrosine, and phenylalanine appear to be latearriving amino acids. In addition, they are considered to have been absent in the abiotic Earth. All three of these amino acids have only two codons each, while many others, earlier in origin, have more. Is this mere coincidence, or might there be some underlying explanation?
Proteins
We generally tend to think of proteins only from a dietary lens, as a component of what we eat. However, they are among the most important and abundant organic macromolecules in the human body, with diverse structures and functions. Every cell contains thousands and thousands of proteins, each with specific functions. Some help in the formation of cellular membrane or walls, some help the cell to move, others act as messages or signals and flow seamlessly from one cell to another, carrying information.
Protein Expression
The method by which living organisms synthesize proteins and further modify and regulate them is called protein expression. Protein expression plays a significant role in several types of research and is highly utilized in molecular biology, biochemistry, and protein research laboratories.
It has been suggested that the present-day triplet genetic code
evolved from a doublet code when there were fewer amino acids
available for primitive protein synthesis. As determined by comparisons of ancient and recently evolved
proteins, cysteine, tyrosine, and phenylalanine appear to be latearriving
amino acids. In addition, they are considered to have
been absent in the abiotic Earth. All three of these amino acids
have only two codons each, while many others, earlier in origin,
have more. Is this mere coincidence, or might there be some
underlying explanation?
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