Multiple Choice
In his transformation experiments, what did Griffith observe when he injected mice with a mixture of heat-killed virulent (S) bacteria and live non-virulent (R) bacteria?
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14. DNA Synthesis
The Griffith Experiment
Multiple Choice
Avery and his colleagues' 1944 experiment showed that DNA __________.
A
consists of sugars, phosphate groups, and bases
B
has two strands held together with hydrogen bonds
C
uses three bases to code for one amino acid
D
contains adenine, guanine, thymine, and cytosine
E
was the substance that transformed the bacteria in Griffith's experiment
Verified step by step guidance1
Understand the context of Avery's experiment: Avery and his colleagues were building on Griffith's earlier work, which demonstrated that a 'transforming principle' could transfer genetic information between bacteria.
Recognize the goal of Avery's experiment: They aimed to identify the chemical nature of the 'transforming principle' that Griffith discovered.
Identify the key finding: Avery and his team discovered that DNA was responsible for the transformation of non-virulent bacteria into virulent forms, indicating that DNA carries genetic information.
Differentiate between the options: The options provided describe various characteristics of DNA, but the specific finding of Avery's experiment was that DNA was the genetic material responsible for transformation.
Conclude with the correct interpretation: Avery's experiment demonstrated that DNA, not protein or any other substance, was the 'transforming principle' in Griffith's experiment, thus establishing DNA as the carrier of genetic information.
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