Active sites

• what the enzyme-substrate complex?

  intermediate structure formed during an enzyme-catalysed reaction in which the substrate and enzyme bind temporarily, such that the substrates are close enough to react
• how does an enzyme-substrate complex form?

  an enzyme acts on its substrate, with which it make temporary bonds at the active site
• what happens when the reaction of the enzyme-substrate complex is complete?

  products are released, leaving the enzyme unchanged and the active site ready to receive another substrate molecule