Enzyme activity is expressed as: (PGI Dec 2006)

Ans: D (Micromoles/min) Enzme activity is expressed as micromoles of substrate converted to product per minute^ under optical condition of measurement. One standard unit {or international unit) of enzyme activity (U) is that activity which catalyses transformation of 1 micromole of substrate per minute.Modern method of enzyme activity is in katals (Kat)1 Kat=Conversion of 1 mole of substrate per second.