Answer :
A bacterial strain contains a. a subgroup of a species with some of the same characteristics.
This is because within one species of microorganism, there can be several subtypes called strains. These strains may be nearly identical genetically but can have very different attributes. For example, the bacterium Escherichia coli (E. coli) includes many different strains, varying in their ability to cause disease.
Strains exhibit subtle genetic differences, which can significantly impact their biochemical activities, nutrient requirements, and conditions for growth. These genetic variations explain why different strains of the same bacterial species can behave and interact with their environments in unique ways.
