Risk which is common to an entire class of assets or liabilities. The value of investments may decline over a given time period simply because of economic changes or other events that impact large portions of the market.
Properties of the alpha-helix. 1  The structure repeats itself every 5.4 Angstroms along the helix axis, ie we say that the alpha-helix has a pitch of 5.4 Angstroms. Alpha-helices have 3.6 amino acid residues per turn, ie a helix 36 amino acids long would form 10 turns.
This structure explains two of the most important properties of the molecule. First, it can be copied or 'replicated', as each strand can act as a template for the generation of the complementary strand. Second, it can store information in the linear sequence of the nucleotides along each strand. DNA helix showing nitrogenous bases. It is the order of the bases along a single strand that constitutes the genetic code. The four-letter 'alphabet' of A, T, G and C forms 'words' of three letters called codons.