Question

1. MSA turns yellow after incubation. what does that mean?
a. Staph. aureus utilized mannitol
b. produced acid turns indicator to red
c. Staph. epidermidis is resistant to salt
d. A+B
e. A+C

Answer 1

Ans- option e) is correct i.e. A+C

Ans. 1. MSA twins yellow after incubation. option e) is correct correct Cie. A+C). > MSA is both selective and differential media which used for isolation of Staphylococci from mixed cultores MSA contains high amount of salt nace of salt Nace this select only gram the or which are resistant to salt concentration of gt contain mannitol Fermentation produce acid end products which yellow colour mannitol medium to twain 0 indicador which turry It also has phenol Red PH yellow in acidic condition. utilized Staph. aureuy → meas of MSA turns yellow that mannitol. ㅋ It is producing yellow colair on medium thus it will change the indicador to yellow. so, option to is incorrect. staph, epidermides is resistant to salt is terme because it ut unable grow plate MSA to ferment mannitol. Overall option e) is correct (A+C). Thes,