Organic molecules range in size form relatively small to very large. You should also understand how these molecules combine together to form the common macromolecules. These compounds are generally not based on carbon, although some have carbon in them. They are generally smaller molecules than are organic compounds. They are often able to cross most cell membranes easily.
Examples are water, carbon dioxide, mineral ions.
Made on the ribosomes. Organic catalysts . Lower the activation energy required to allow the chemical reaction to proceed. Specific for a single substrate or for a group of similar substrates. This is one explanation for the mechanism of action of enzymes.