Agar is known to be a gelatinous polymer substance that was commonly used in the laboratory setting as a substrate. Thus, nutrients agar can grow different types of microbes such as fungi and bacteria while MacConkey agar is made with bile salts and crystal violets, these additives cause the agar to only grow Gram – negative bacteria. However, nutrients agars grow more organisms because it contains nutrients from either beef broth or yeast extracts when compared with MacConkey agar.
