In His Transformation Experiments, What Did Griffith Observe

question 26

Multiple Choice

In his transformation experiments, what did Griffith observe?

• A) Mutant mice were resistant to bacterial infections.
• B) Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.
• C) Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic.
• D) Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains.
• E) Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.

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Definitions:

Null Hypothesis

A statistical hypothesis that assumes no significant difference or effect and serves as the default or starting assumption in hypothesis testing.

Binomial Parameters

Refer to the number of trials (n) and the probability of success (p) in a binomial distribution, which determines the behavior of this discrete probability distribution.

Alternative Hypothesis

In statistical hypothesis testing, a statement that contradicts the null hypothesis, suggesting that there is a statistically significant difference between observed data and the expected outcome under the null hypothesis.

Two-tail Test

A statistical test in which the critical area of a distribution is two-sided and tests whether a sample is either greater than or less than a range of values.