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Other regions of the protein thread are folded into other forms in what is called the secondary structure. In proteins, only right handed helices are observed.

Protein thread is folded in the form of a helix, (similar to a revolving staircase) The last amino acid is called the C-terminal amino acid. The first amino acid is called as N-terminal amino acid. (b) Secondary Structure : A protein is imagined as a line, the left end is represented by the first amino acid and the right end represented by the last amino acid. (a) Primary Structure : The sequence of amino acids i.e., the positional information in a protein - which is the first amino acid, which is second, and so on - is called the primary structure. Physicists conjure up the three dimensional views of molecular structures while biologists describe the protein structure at four levels. Organic chemistry always write a two dimensional view of the molecules while representing the structure of the molecules (e.g., benzene, naphthalene, etc.). In inorganic chemistry, the structure invariably refers to the molecular formulae (e.g., NaCl, M g C l 2, etc.). Structure of molecules means different things in different contexts.

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