Answer:
Saccharomyces cerevisiae (S. cerevisiae) is a species of yeast. It is basically used in food production such as brewing , winemaking, and baking.
S. cerevisiae is used in gram staining, a technique that is used to differentiate two different groups of bacteria on the basis of different cell wall constituents.
Due to variation in the cell wall of S. cerevisiae, it doesn’t contain any lipid layer in its cell wall unlike bacteria. When primary stain and secondary stain are used during gram staining, it turns into several colors like purple, pink, brown, and green. That is why S. cerevisiae gives gram positive and gram negative effects both.
