Enzymes are biological catalysts. Some textbooks say that catalysts only speed up reactions, whereas other state that they can either speed up or slow down reactions.
Generally speaking, enzymes actually speed up reactions. However, you can say they also slow down reactions because other enzymes may convert "product" produced from one enzyme back into the "substrate". Does this make sense?
Enzymes are biological catalysts. Some textbooks say that catalysts only speed up reactions, whereas other state that they can either speed up or slow down reactions.
enzymes are biological catalysts comprised of protein. they predominantly speed up reactions, making them occur at a faster rate then what the reaction would occur without the enzyme. make sense?