Question

Which of the following bacteriophage is an avirulent?

• A. Coliphage M12
• B. K phage
• C. T4 phage
• D. None of the above

Answer 1

Answer: (D)

None of the above

Avirulent bacteriophages are those bacteriophages which are no longer pathogenic (toxic) or no longer virulent.

Coliphage M12, K phage, and T4 phage are the virulent phage.

A coliphage is a type of bacteriophage that infects Escherichia coli.

A coliphage is a type of bacteriophage that infects Streptococcii.

T4 is a bacteriophage that infects Escherichia coli bacteria. The T4 phage is a member of the T-even phages, a group including entero- bacteriophages T2 and T6. T4 is capable of undergoing only a lytic lifecycle and not the lysogenic lifecycle. Thus, the correct answer is option D.