# A culture of bacteria is infected with bacteriophage at a multiplicity of 0.3. The probability of a single cell infected with 3 phages is (A) 0.009 (B) 0.027 (C) 0.9 (D) 0.27

A culture of bacteria is infected with bacteriophage at a multiplicity of 0.3. The probability of a single cell infected with 3 phages is

(A) 0.009

(B) 0.027

(C) 0.9

(D) 0.27

## Answer

Answer: (A) 0.009

The multiplicity of infection (MOI) is the ratio of phages to bacteria. The probability of a single cell being infected with exactly 3 phages can be calculated using the Poisson distribution formula. For MOI = 0.3, the probability is approximately 0.009.