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Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD
● They either act inside the producing cell (endo-enzymes or Intracellular enz.) or
secreted outside the producing cell where they act (exo-enzymes or extracellular enz.).
● The first type is common in higher plant cells, while the second is common for
the lower organisms; bacteria and fungi.
Properties of enzymes
(1) Catalytic properties
(2) Specificity
(3) Reversibility
(4) Sensitivity
(1) Catalytic properties
o Enzymes can influence the speed of the reaction without being consumed or
affected in a very small amount.
o The activity of the enzyme is measured by its turnover number which is the
number of moles of the substrate converted per minute by one mole of enzyme.
This number may vary from 100 to 3000,000.
(2) Specificity
o Enzymes act only on its specific substrate or a group of specific substrates or
catalyze specific metabolic reaction.
o Examples: Sucrase acts on can sugar, Lactase acts on milk sugar (lactose), Lipase
acts on fats.
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