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For the selection of lactobacilli present in cheddar cheese, the pH of the medium is maintained at

  • A.6.35
  • B.5.35
  • C.4.35
  • D.5.75

Answer: B

Correct answer: 5.35

Lactobacilli tolerate acid far better than most organisms, so setting the medium at about pH 5.35 selects for them: they grow while the competing flora of the cheese are held back.

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