Nominal Ordinal Interval Ratio Nominal The lowest measurement level you can use, from a statistical point of view, is a nominal scale. A nominal scale, as the name implies, is simply some placing of data into categories, without any order or structure.ominal Ordinal Interval Ratio Nominal The lowest measurement level you can use, from a statistical point of view, is a nominal scale. A nominal scale, as the name implies, is simply some placing of data into categories, without any order or structure.
In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond. See Fig. 3-7.
Hydrogen-bond interactions between the bases allow two strands of DNA to form the double helix. These interactions are specific: A base pairs with T, and C base pairs with G. This occurs via hydrogen bonds, which are shown with dotted lines in the figure above.