a. False. Enzymes are very specific and usually interact with only one type or a few closely related substrates rather than many different substrates .b. False. Enzymes do not change shape permanently after a reaction. They may undergo a temporary change while binding, but they return to their original shape once the reaction is complete .c. True. An enzyme can be reused with a new substrate because it is not consumed or permanently altered by the reaction. It recovers its original shape to catalyze another reaction .d. True. The substrate is changed in the reaction, as enzymes catalyze the conversion of substrates into products .e. True. If the shape of the enzyme changed permanently (denatured), it would no longer work since the shape is critical for binding the substrate .f. True. When all substrates are used up, the reaction stops because there is no more substrate for the enzyme to act upon .These answers reflect how enzymes work in biological systems with specificity, reusability, and dependence on shape and substrate availability[tex].[/tex]