In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Q: Question: The active center of an enzyme:
Options: <0> It is formed by functional groups that come from the central amino acid sequence of the enzyme. <1> It constitutes a large part of the total volume of the enzyme. <2> Increases the G of a reaction, increasing the speed of it. <3> It has a high amount of water molecules together with amino acids. <4> It is the region that joins the substrates and contains the waste that participates in the formation and breaking of links.
A:
chemistry