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S and R strains have several subtypes wh...

S and R strains have several subtypes which one were used by Griffith.

A

S III and R II

B

S II and R III

C

S IV and R III

D

S V and R II

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Context**: The question refers to the S and R strains of *Streptococcus pneumoniae* used in Griffith's transformation experiment. 2. **Identifying the Strains**: Griffith worked with two specific subtypes of *Streptococcus pneumoniae*: - **S strain**: This strain is virulent and causes pneumonia. The specific subtype used by Griffith was **S3**. - **R strain**: This strain is non-virulent and does not cause disease. The specific subtype used by Griffith was **R2**. 3. **Characteristics of the Strains**: - The **S3 strain** is referred to as "smooth" because it produces a muco-polysaccharide capsule that gives the colonies a smooth appearance. - The **R2 strain** is referred to as "rough" because it lacks this capsule, resulting in a rough appearance of the colonies. 4. **Conclusion**: Based on Griffith's experiment, the specific strains he used were **S3 (virulent)** and **R2 (non-virulent)**. 5. **Final Answer**: The S and R strains used by Griffith were **S3 and R2**. ---
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