<prompt> Unit of enzyme activity -Millimoles litMilligmlitMgdlMicromolesmin  <response>: Ans. is d i.e., Micromole minute o The activity of enzyme is measured in terms of the following :1 Unit of enzyme acdvity: - By international agreement, one unit enzyme activity is defined as the amount causing transformation of 1.0 micro mole of substrate per minute at 25deg C. It is usually expressed as m mole of substrate disappeared or p mole of product formed per minute.2 Specific activity:- It refers to the number of enzyme units per milligram of protein. It is a measure of enzyme purity; higher the enzyme purity, more is the specific activity.3 Ttirn over number This refers to the number of substrate molecules transformed per unit time by a single enzyme molecule or by a single catalytic site, when the enzyme concentration alone is rate-limiting factor. Catalase has the highest turnover number and hence is the fastest active enzyme. Carbonic anydrase has the 2nd fastest turnover number; therefore, it is 2nd fastest active enzyme after catalase. Lysozyme has the lowest turnover number and therefore is slowest acting. 