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In the following description of the function of pectinase, the mistakes are: (a) Pectinase is a catalyst, which can change the reaction speed; (b) Pectinase is added to fruit juice.
A, enzyme can reduce the activation energy of chemical reaction, so pectinase can change the reaction speed, A is correct;

B, fruit juice contains a lot of pectin, and the substance is insoluble in water, so using the specificity of enzyme, pectinase can decompose pectin, make pectin decompose into galacturonic acid, and make cloudy fruit juice clear, B is correct;

C. Pectin is a polymer compound polymerized from galacturonic acid. Pectinase can decompose pectin into galacturonic acid. C is wrong.

D Pectin is one of the main components of plant cell wall and intercellular layer, so pectinase can disintegrate it. D is correct.

So choose: C.

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