Question

A ______________________ is a “lawn” of plated bacteria indicates the presence and activity of wild-type bacteriophage that have undergone recombination.

ANSWERS:

plaque

lysogenic colony

lytic phage

a lytic colony

none of these choices are correct

Answer 1

Answer - plaque

- lysis of a bacteriophage infected cell of bacteria indicates the plaque, it is just the clear area found within the lawn of bacteria.the area of plaque won't increase with deprived nutrient conditions. that is , with low nutrients the recombinant wild type bacteriophages activity will be less, hence plaque can be used as the indicator.

- lysogenic colony refers to a group of phages that can integrate  DNA of phage in susceptible bacteria, followed by the passing of phage DNA to the next generations of bacteria. As the presence of wild type bacteriophage is not indicated in this colony, it is not the answer.

- The lytic colony refers to a group of phages that can cause the replication of DNA of phage in susceptible bacteria, followed by release of new phages by the lysis of the cell. they won't indicate the presence of wild type bacteriophage, hence not the answer.

-lytic phage, are those who can induce the lysis of the bacterial cells. as they are not lawn of plated bacteria, it is not the answer.

As plaque is the answer, last option is incorrect.