Uninoculated Mannitol salt agar is what color? Pink, green, clear yellow or blue.
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Mannitol salt agar is a culture medium that contains high salt (NaCl) concentration, mannitol (a fermentable sugar), and a pH indicator that is yellow at acidic conditions and red at alkaline or neutral conditions. (Acids are released when microbes ferment mannitol.) The medium also contains other carbohydrates that allow growth of non-fermenting halophilic organisms. Non-halophilic organisms will not grow on this mannitol salt agar. When uninoculated, the medium is red. Question: If you inoculate a non-halophilic mannitol fermenter, what color will the medium be after incubation? red yellow clear
Sloka M.
Mannitol Salt Agar contains mannitol, sodium chloride, and phenol red. The role of sodium chloride in the medium is: - To select for all gram positive bacteria - To select for all gram negative bacteria - To inhibit organisms other than Staphylococci - To differentiate Mannitol Salt agar (MSA) from Staphylococcus medium 110 (SM H10) 17. Which of the following is not a selective and differential medium for the growth of Gram negative enteric bacteria? - MacConkey Agar - Hektoen Agar - Xylose Lysine Desoxycholate (XLD) Agar - Fluid Thioglycollate Medium (FTM) 18. When incubated in Hektoen enteric agar, Shigella sp. and Salmonella sp. will be expected to produce: - Smooth colorless colonies - Reddish mucoid colonies - Greenish blue colonies - Bright orange pigmented colonies
Adi S.
Gram staining is a procedure that microbiologists use to a. determine if a bacterial strain is a pathogen. b. determine if a bacterial sample can break down oil. c. infer the structure of a bacterial cell wall and the bacterial response to antibiotics. d. count bacteria in medical or environmental samples. e. do all of the above.
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