Bacteria used in Griffith’s experiment is
**Core Concept**
Griffith's experiment was a landmark study that demonstrated the role of genetic material in the transformation of bacteria. The experiment involved the transformation of non-pathogenic bacteria into pathogenic bacteria, which led to a deeper understanding of the concept of genetic transformation. This principle is crucial in understanding the mechanisms of bacterial virulence and the development of bacterial infections.
**Why the Correct Answer is Right**
Griffith's experiment used the bacterium **Streptococcus pneumoniae**, which is a common cause of pneumonia. The experiment involved the transformation of non-pathogenic S. pneumoniae into pathogenic S. pneumoniae using heat-killed virulent S. pneumoniae. This process showed that the genetic material from the virulent bacteria was transferred to the non-pathogenic bacteria, resulting in the transformation of the latter into a pathogenic form. The genetic material responsible for this transformation was later identified as **DNA**.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a bacterium that was used in Griffith's experiment. While this bacterium may be relevant to other areas of microbiology, it is not directly related to Griffith's experiment.
**Option B:** This option is incorrect because it is a type of bacteria that was not used in Griffith's experiment. While this bacterium is an important cause of disease, it is not the one that was used in this landmark study.
**Option C:** This option is incorrect because it is a different type of bacteria that was not used in Griffith's experiment. While this bacterium is relevant to other areas of microbiology, it is not directly related to Griffith's study.
**Clinical Pearl / High-Yield Fact**
One important fact to remember is that Griffith's experiment laid the foundation for the discovery of DNA as the genetic material responsible for bacterial transformation. This discovery had significant implications for our understanding of the mechanisms of bacterial virulence and the development of bacterial infections.
**Correct Answer: D. Streptococcus pneumoniae**