Multiple choice

Which of the statements about Coiynebacterium diphtheriae biology is NOT CORRECT?

  1. All strains of C. diphtheriae are producers of diphtheria toxin

  2. Diphtheria toxin production can be minimized by high concentration of iron in the medium

  3. Diphtheria toxin inhibits protein synthesis

  4. Diphtheria toxin is an A-B toxin secreted as a polypeptide of 62 kDa
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A Correct answer
Explanation

Not all strains of C. diphtheriae produce the toxin; only those lysogenized by the beta-phage carrying the tox gene are toxigenic.

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