Biology 15 General Microbiology Score (20) Name Maricl Vargas Selective and Diff
ID: 213232 • Letter: B
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Biology 15 General Microbiology Score (20) Name Maricl Vargas Selective and Differential Prelab Worksheet You will be taking a quiz on selective and differential media as soon as class begins on Wednesday 3/21. You will be expected to know how to spell all organisms and all media types without the help of a word list. After the quiz, you will interpret your results with the help of this worksheet. You will not be allowed to receive help from others as you interpret your own results. Finally, you will help other students interpret their results before you leave lab. (5 pts) Describe the expected appearance for each agar/organism combination. Mark across the box with an X If the organism will not grow on the agar. Escherichia coli Proteus vulgaris Enterobacter Staphylococcus Staphylococcus aerogenes aurous Mannitol Salt Agar MacConkey Agar Eosin Methylene Blue Agar Study Questions 1.) What is the definition of a differential medium? bome type of oreanisny un color (15 pts) 2.) What is the definition of a selective medium? 3.) Which medium used in lab so far this semester is neither selective nor differential?Explanation / Answer
X
no growth as it is Gram Positive
E.coli Proteus vulgaris Enterobactor aerogenes Staphylococcus epidermidis Staphylococcus aureus mannitolsalt agar yellow coloured colonies pink coloured colonies pink coloured colonies pink coloured colonies yellow coloured colonies macconkey agar pink coloured colonies dull yellow colouredor colourlesscolonies pink coloured colonies X X Eosin methylene blue agar dark purple colony with green metalic sheen colour less or takes colour of medium pink coloured colonies pin point coloniesX
no growth as it is Gram Positive
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