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)

I have been asked this question in an online quiz.

My question is based upon The Search for Genetic Material in chapter Molecular Basis of Inheritance of Biology – Class 12

Answer 1

The correct answer is (b) Shiny colonies (S) and Rough colonies (R)

The best I can explain: 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.