The earliest step is:
E. Formation of Amino acid building blocks.
Explanation:
Most of the enzymes are proteins. They act as biocatalyst and alter the rate of biochemical reaction.
- Proteins are unbranched polymers constructed from 22 standard α-amino acids.
- Amino acids act as monomers of protein and are composed of an amino group, a carboxyl group, a hydrogen atom and a distinctive side chain, all bonded to a carbon atom.
- Amino acid join together to form peptides and polypeptides.
Thus during the formation of a protein structure or an enzyme the sequence of step are as follows:
- E. Formation of amino-acid building blocks
- A. Joining amino-acids into a polymer like beads on a string (this order is the 'primary structure')
- B. The first part of the protein folds due to side-chain and backbone interactions
- D. The final protein tertiary structure is completed with the addition and folding of the last parts of the protein.
- C. Enzymatic function is possible due to the completed tertiary structure creating an 'active site' region of the protein
