The lock-and-key model

• what does the unique shape of the active site mean for the enzyme?

  that the enzyme can only catalyse 1 type of reaction - other molecules with different shapes, will not fit
• what does enzyme specificity mean?

  that an enzyme is specific for its substrate - this concept gave rise to ‘the lock-an—key theory’
• what is this a diagram of?

  the enzyme-substrate complex / lock-and-key theory