Fred Griffith Studied Two Strains of Streptococcus Pneumonia, One That

question 14

Multiple Choice

Fred Griffith studied two strains of Streptococcus pneumonia, one that causes a lethal infection when injected into mice, and a second that is harmless.He observed that pathogenic bacteria that have been killed by heating can no longer cause an infection.But when these heat-killed bacteria are mixed with live, harmless bacteria, this mixture is capable of infecting and killing a mouse.What did Griffith conclude from this experiment?

• A)The infectious strain cannot killed by heating.
• B)The heat-killed pathogenic bacteria "transformed" the harmless strain into a lethal one.
• C)The harmless strain somehow revived the heat-killed pathogenic bacteria.
• D)The mice had lost their immunity to infection with S.pneumoniae.

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Definitions:

Fundamental Emotions

Core emotional experiences that are universally recognized, such as happiness, sadness, fear, and anger, among others.

Jealousy

A complex emotion that often involves feelings of insecurity, fear, and concern over a relative lack of possessions or safety, particularly in personal relationships.

Social Emotions

Emotions that cannot be understood or defined without reference to the social world; emotions that (1) involve an awareness of oneself in the social context, (2) emerge out of interaction with at least one other actor, and (3) are often experienced in reference to some kind of societal standard.

Societal Standard

Norms and expectations established by society that guide the behavior of its members, often reflecting shared values or beliefs.