(10 pts) Name ALL the ingredients that cause the selective and/or differential n
ID: 196098 • Letter: #
Question
(10 pts) Name ALL the ingredients that cause the selective and/or differential nature of each media listed below (DO NOT INCLUDE pH indicators or abbreviations): a. MSA Selective: GanG Differential : b. BEA . Selective: Gm Differential: Mano c. PEA . Selective: rmt . Differential: t ffere aa d. EMEB Selective: Blue dre Differential: BileHs e. MAC . Selective: Grm . Differential:/o (2 pts) Strong carbohydrate fermenters turn and turn tran ve//ok.t (color) on MSA due to the pH (color) on MacConkey dueExplanation / Answer
1) MSA is selective for gram positive since it consists of high salinity which allows growth of S.areus..ec. which can grow in high saline conditions.
MSA is differential for mannitol fermenting bacteria.
2) BEA is selective for enterococus bacteria which depend on bile salts.
Its differential component is esculin.
3) PEA selective component is pheny ethyl alcohol.
4) EMB selective component is eosin and methylene blue dyes which allow the growth of gram negative bacteria only.
EMB agar medium is the differential component.
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