Describe three general ways in which enzyme activity can be regulated.

Enzyme activity can be regulated in many ways. Enzyme
activity is dependent to a large extent on factors like pH, temperature, enzyme
concentration, substrate concentration, salinity,
etc.

• One way of regulating enzyme activity is by
  controlling the temperature. Enzyme activity is usually increased at higher temperatures
  and decreases to almost zero as temperatures are reduced. The best rate of activity has
  a narrow temperature range.

• Another
  way of changing enzyme activity is by altering the salinity and pH of the medium that
  the enzyme and the substrate is in.
  

• Enzyme activity is also changed if
  the enzyme concentration itself or that of the substrate is increased. If there is
  enough substrate for the enzyme to act on increased activity is achieved by higher
  enzyme concentrates.