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Enzymes are most often referred to by their common names which often, but not always, describes the reaction catalyzed by the enzyme. The E.C. system for enzyme nomenclature is more formal and gives enzymes a series of numbers. An example of an enzyme is glucokinase which catalyzes the reaction shown.

$$\text{glucose} \space +\space ATP\space \xrightarrow [ ]{ } \text{glucose-6-phosphate} \space +\space ADP$$

The designation for this enzyme using the E.C. system is

The first 2 in the E.C. designation refers to the fact that this enzyme
Select Option has two substrateshas a Michaelis constant of 2 mMis a transferase which is the second category of six for enzymestakes 2 minutes to catalyze the reaction
and the 7 refers to the fact that the enzyme
Select Option it was the seventh enzyme named using this systemtransfers a phosphate group, which is the seventh on a list of transferred groupstakes 7 minutes to complete the reactionhas a Michaelis constant of 7mM
. This alone does not completely reveal all of the details of the chemical reaction. Another detail that can be specified is
Select Option which molecule transferred the phosphatethe energy level of the productthe Michaelis constant for a substratethe time to form the first molecule of product
and the third number in the E.C. system designates that.
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