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MICROBIOLOGY LAB PRACTICAL – FINAL EXAM 2026|2027 QUESTIONS WITH VERIFIED ANSWERS| LATEST UPDATE

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MICROBIOLOGY LAB PRACTICAL – FINAL EXAM 2026|2027 QUESTIONS WITH VERIFIED ANSWERS| LATEST UPDATE

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MICROBIOLOGY LAB PRACTICAL – FINAL EXAM 2026|2027 QUESTIONS
WITH VERIFIED ANSWERS| LATEST UPDATE

Streptococcus pneumonia - Correct Answer -GPC in pairs




Strep pyogenes - Correct Answer -GPC in chains




Neisseria - Correct Answer -GN diplococcus




Hemophilus - Correct Answer -GN pleomorphic rod




Mycoplasma - Correct Answer -neg for Gram Rxn




Mycobacterium - Correct Answer -Neg or variable for Gram Rxn




MSA - Correct Answer -Mannitol Salt Agar



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,MAC - Correct Answer -MacConkey Agar


Salmonella - Correct Answer -GNR




Shigella - Correct Answer -GNR




Serratia marcescens - Correct Answer -GNR




Staphylococcus aureus - Correct Answer -GPC (in clusters)




Staph epidermidis - Correct Answer -GPC in pairs and tetrads




Staph saprophyticus - Correct Answer -GPC in single or pairs




Streptococcus - Correct Answer -GPC



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,Strep agalactiae - Correct Answer -GPC in long chains




EMB - Correct Answer -Eosin Methylene Blue Agar




MSA agar - selects for? - Correct Answer -gram positive b/c gram negative cannot grow in presences of
salt




MSA agar selective agent - Correct Answer -7.5% salt




MSA differential agent - Correct Answer -mannitol and phenol red




MSA - purpose of mannitol? - Correct Answer -test for fermentation of sugars




MSA - purpose of phenol red - Correct Answer -pH indicator
low pH - yellow
neutral pH - orangish red
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, high pH - pinkish red




MSA - example bacteria - Correct Answer --Staphylococcus aureus - yellow (low pH) - (+) for
fermentation
- Staphylococcus epidermis - pink (high pH) - (-) for fermentation




MAC agar contents - Correct Answer -bile salts
neutral red
lactose




MAC agar selective agent - Correct Answer -bile salts - support gram negative




MAC agar differential agents - Correct Answer -neutral red
lactose




MAC agar - purpose of neutral red - Correct Answer -pH indicator
low pH - red/purple/pink colonies
neutral - colorless


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