competitive

• competitive inhibitor molecules have a similar shape to that of substrate molecules
• they compete with substrate molecules to bind to the active site, no reaction takes place
• they block the active site so no substrate molecules can fit in
• inhibitor molecules bind to the active site of an enzyme and prevent the substrate from binding
• how much an enzyme is inhibited depends on the relative concentrations of the inhibitor and the substrate
• if there's a high concentration of the inhibitor, it will take up nearly all of the active sites and hardly any of the substrate will reach the enzyme
• if there's a higher concentration of substrate the substrates chances of getting to an active site before the inhibitor increases.

  increasing concentration of substrate increases rate of reaction to a point.