Answer to Question #48407 in Microbiology for Chris Kay

Question

I have 2 test tubes labeled "Strep E" and "Strep E Buffer" The "Strep E" test tube contains "Staphylococcus Epidermidis and Lysozyme" The "Strep E Buffer" test tube contains "Staphylococcus Epidermidis and a Buffercontrol" I understand how Lysozyme breaks down peptidoglycan in the "Strep E" test tube So my question is Why is the "Strep E Buffer" test tube that contains no Lysozyme useful in this experiment? How can it be used as a comparison? Thanks