Question

When Streptococcus pneumoniae were cultured in a culture plate by Frederick Griffith, which among the following were produced?

• A. Smooth colonies(S) and Rough colonies (R)
• B. Shiny colonies (S) and Rough colonies (R)
• C. Smooth colonies (S) and Rigorous colonies (R)
• D. Silky colonies (S) and Rigorous colonies (R)

Answer 1

Answer:

B. Shiny colonies (S) and Rough colonies (R)

In 1928, Frederick Griffith cultured the pneumococcus bacterium. He observed that those bacteria were producing different colonies. These colonies were named as the S and R colonies. The S colonies are the Shiny colonies because they had the mucous(polysaccharide) coat. The R colonies are the Rough colonies because they did not possess the mucous coat.