谁能帮写一篇作文介绍enzytme要是英语的.不要太短!

没有enzytme只有enzym e酶（英语：Enzyme,又称酵素）,
Enzymesare proteins that catalyze (i.e.,increase the rates of) chemical reactions.enzymatic reactions,the molecules at the beginning of the process,called substrates,are converted into different molecules,called products.Almost all chemical reactions in a biological cell need enzymes in order to occur at rates sufficient for life.Since enzymes are selective for their substrates and speed up only a few reactions from among many possibilities,the set of enzymes made in a cell determines which metabolic pathways occur in that cell.