Identify the wrong statements

I. All enzymes are proteins                                   
II. All proteins are enzymes
III. Enzymes are sensitive to temperature           
IV. Enzymes increase the activation energy

All enzymes are not proteins. Some are made of RNA such as ribozyme which has 23S rRNA. All proteins are not enzymes. Some proteins are storage, some are structural and some are functional proteins. Enzymes are a type of functional proteins. Enzymes decrease the activation energy.