GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Griffith obtained his results despite the fact that he failed his medical board exam
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DNA, not protein, was found to be the genetic molecule
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Something from a dead organism could change living cells
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Viruses, which were nonliving, could change living cells
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Detailed explanation-1: -What was the most significant conclusion of Griffith’s experiments with pneumonia in mice? The experiment conducted by Griffith found that bacteria are capable of transfering genetic information through transformation.
Detailed explanation-2: -Griffith concluded that the R-strain bacteria must have taken up what he called a “transforming principle” from the heat-killed S bacteria, which allowed them to “transform” into smooth-coated bacteria and become virulent.
Detailed explanation-3: -Griffith observed that in the blood of dead mice, both R and S type of bacteria were present. He thus concluded that heat-killed smooth type bacterial caused a transformation of the living rough type bacteria. This experiment suggested that DNA and not proteins are the genetic material.
Detailed explanation-4: -What was the most significant conclusion of Griffith’s experiments with pneumonia in mice? There is a substance present in dead bacteria that can cause a heritable change in living bacteria.
Detailed explanation-5: -Griffith concluded that the type II-R had been “transformed” into the lethal III-S strain by a “transforming principle” that was somehow part of the dead III-S strain bacteria. Today, we know that the “transforming principle” Griffith observed was the DNA of the III-s strain bacteria. Was this answer helpful?