Assume That One Counted 67 Plaques on a Bacterial Plate

question 35

Multiple Choice

Assume that one counted 67 plaques on a bacterial plate where 0.1 ml of a 10^-5 dilution of phage was added to bacterial culture.What is the initial concentration of the undiluted phage?

• A)6.7 × 10^-5 pfu/ml
• B)0.1 × 10⁵ pfu/ml
• C)6.7 × 10⁵ pfu/ml
• D)67 pfu/ml
• E)6.7 × 10⁷ pfu/ml pfu = plaque- forming units

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