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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Definitions:

Elaboration

The process of adding more detail or information to a concept, theory, or method.

Dual-coding

A theory that suggests information is better remembered and understood when presented both visually and verbally.

Suggestibility

The degree to which an individual's beliefs, perceptions, or memories can be influenced by external factors such as ideas or misinformation.

Memory Sin

Errors or distortions in the recall of memories, often categorized into specific types such as transience, absent-mindedness, or misattribution.