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

question 6

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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