Which one of the following statements about enzymes is true? 1 . Enzymes are proteins whose shape does not help in their functions. 2 . Enzymes lower the reaction rate by lowering the activation energy. 3 . Enzymes do not show a high specificity during biological reactions. 4 . Enzyme activity is affected by the change in temperature and pH.

Step-by-step solution

Enzymes are proteins whose three-dimensional shape is key to their functions. Enzymes are highly specific in their reactions by having an active site to bind to their substrates. Enzymes are biocatalysts which increase the rate of the reaction by lowering down the activation energy of the reaction at the cellular level. Enzymes are highly sensitive to the changes in temperature and pH. Higher temperatures and low pH degrades the enzymes.