Exam (elaborations) BIO250L LAB 4 SELECTIVE MEDIA & AGAR.
BIO250L LAB 4 SELECTIVE MEDIA & AGAR. Post-Lab Questions 1. What substance in MSA confers selectivity? Why? The substance in MSA that confers selectivity is sodium chloride because most bacteria cannot grow in high salt environment. 2. What substance makes MSA differential? Why? Differential media contains compounds that distinguish various microorganisms growing on the same cultured plate; via color or functional effect on media. The substance that makes MSA differential is mannitol because it can be fermented by Staphylococcus aureus effectively.
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