It is a biological catalyst, a catalyst being something that encourages a chemical reaction to proceed at a faster rate than it would do normally.

These are biological catalysts, and they control the crucial steps in the workings of the cell: that is, in the cell's metabolism.

Chemical reactions in a living cell are guided by biological catalysts known as enzymes.

They are biological catalysts - other words they trigger off or speed up a process such as the break down of waste in an aquarium.

They contain 75% of the minerals, amino acids, proteins, phytohormones and biological catalysts (enzymes) found in the tree.

While enzymes often serve the body by cutting things apart, they are actually biological catalysts that speed the pace of chemical reactions.

They are only made possible by enzymes - biological catalysts that speed up their chemical reactions to a respectable level.

Before the discovery of ribozymes, enzymes, which are defined as catalytic proteins, were the only known biological catalysts.

A myriad of different enzymes, often called biological catalysts, govern almost everything a cell can do or become.

Meanwhile, Arnold's research remains focused on more fundamental problems, such as streamlining directed-evolution techniques and seeing what other useful biological catalysts can be made.