Why Do Streptococcus Pneumoniae Colonies on Sheep Blood Agar (SBA)appear

question 27

Multiple Choice

Why do Streptococcus pneumoniae colonies on sheep blood agar (SBA) appear like a coin-raised edges and a depressed center?

• A) The older growth at the center is smaller due to lack of nutrients.
• B) The newer growths on the outside of the colony undergo the Quellung reaction.
• C) The older growth at the center is killed due to autolysis.
• D) The newer growth has a thicker capsule, therefore it appears raised.

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