Frederick Griffin Demonstrated That the Pneumonia-Causing Characteristics of the Smooth

question 3

Multiple Choice

Frederick Griffin demonstrated that the pneumonia-causing characteristics of the smooth bacteria were somehow transferred to the harmless rough bacteria in mice. These characteristics continued to appear in subsequent generations of the previously harmless rough bacteria. What did this show about the mechanism behind the change?

• A) It was a highly stable mechanism, so it didn't change again over time.
• B) The mechanism couldn't go in reverse (i.e., the bacteria couldn't become harmless once they were changed).
• C) The mechanism was involved in heredity so the change was passed on.
• D) This result didn't make any sense, so it doesn't say anything about the mechanism.
• E) The smooth bacteria have a much stronger infecting mechanism than the rough do.

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Definitions:

Regression Models

Statistical models used to estimate the relationships among variables, often used to predict a dependent variable based on one or more independent variables.

Collinearity

A statistical phenomenon in which two or more predictor variables in a multiple regression model are highly correlated, potentially leading to unreliable estimates of the coefficients.

Intercorrelation

A statistical correlation between two or more variables or sets of data.

Simple Regression Analysis

Simple Regression Analysis is a statistical technique for estimating the relationship between a dependent variable and a single independent variable.