Answer :
An auxotrophic strain refers to a bacterial strain that lacks the ability to synthesize a specific nutrient and, as a result, relies on the external supply of that nutrient in its growth medium. Here option C is the correct answer.
These strains have undergone genetic mutations or alterations that have disrupted the metabolic pathways responsible for the production of the particular nutrient.
When an auxotrophic strain is grown on a minimal medium, which lacks the specific nutrient it cannot synthesize, it fails to grow or exhibits severely impaired growth. However, when the required nutrient is added to the growth medium, the auxotrophic strain can resume normal growth and proliferation.
Auxotrophic strains are commonly used in laboratory settings for various purposes, such as genetic studies, molecular biology research, and biotechnological applications. By manipulating the growth medium and controlling the availability of specific nutrients, researchers can investigate the effects of nutrient deficiencies, study metabolic pathways, or perform genetic complementation experiments to understand the function of specific genes.
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Complete question:
What is the term for a bacterial strain that cannot synthesize a particular nutrient and therefore requires that nutrient to be included in its growth medium?
A) Autotrophic strain
B) Heterotrophic strain
C) Auxotrophic strain
D) Prototrophic strain
