The bacteria that Griffith experimented with were termed "R" and "S" bacteria because:

• A. Of the way they grew on artificial media.
• B. The "S" bacteria formed smooth appearing colonies.
• C. The "R" bacteria formed rough appearing colonies.
• D. All are correct.

Answer: (D)

Verified step by step guidance

1. Understand the context of Griffith's experiment: Griffith's experiment was a pivotal study in genetics that demonstrated the phenomenon of transformation in bacteria.
2. Identify the characteristics of 'S' and 'R' bacteria: 'S' bacteria are known for forming smooth colonies, while 'R' bacteria form rough colonies. This distinction is based on their appearance when grown on artificial media.
3. Recognize the significance of colony appearance: The smooth appearance of 'S' bacteria is due to the presence of a polysaccharide capsule, which is absent in 'R' bacteria, leading to their rough appearance.
4. Consider the implications of these characteristics: The differences in colony appearance are crucial for understanding the transformation process, as Griffith observed that 'R' bacteria could be transformed into 'S' bacteria under certain conditions.
5. Conclude that all statements are correct: Each statement about the growth and appearance of 'R' and 'S' bacteria is accurate and contributes to the understanding of Griffith's experiment.