Which observation from Griffith's experiment with Streptococcus pneumoniae provided the strongest evidence for the existence of a 'transforming principle'?
Live non-virulent bacteria did not cause disease in mice.
Heat-killed virulent bacteria did not cause disease in mice.
Live virulent bacteria caused disease in mice.
Heat-killed virulent bacteria, when mixed with live non-virulent bacteria, caused the latter to become virulent.
Related Questions
In Hershey and Chase's experiment, what was the key observation that supported DNA as the genetic material?
Radioactive sulfur () was found inside the bacteria.
Radioactive phosphorus () remained outside the bacteria.
Both radioactive sulfur () and phosphorus () were found inside the bacteria.
Radioactive phosphorus () was found inside the bacteria.
From his transformation experiment Griffith concluded with transforming principle might be?
DNA
Polysaccharide Capsule
RNA
None
Which of the following is NOT a key feature of the transforming principle, as demonstrated by Griffith?
It is composed of protein.
It can change the characteristics of bacteria.
It can be passed from one generation of bacteria to the next.
It was later identified as DNA.
Which of the following is NOT a characteristic of a good genetic material?
Able to replicate accurately
Chemically and structurally stable
Must be easily degradable
Scope for slow changes (mutations)
Which experiment definitively proved that DNA, and not protein, is the genetic material?
Griffith's experiment with Streptococcus pneumoniae
Avery, MacLeod, and McCarty's experiment with bacterial transformation
Hershey-Chase experiment using bacteriophages
Meselson-Stahl experiment demonstrating semi-conservative replication
In the Hershey-Chase experiment, why was radioactive sulfur (35S) used to label phage proteins?
Sulfur is a component of both DNA and protein
Sulfur is a component of proteins but not DNA
Sulfur is easily detectable in bacterial cells
Sulfur is a common component of bacterial cell walls
From his transformation experiment Griffith concluded with transforming principle might be?
DNA
Polysaccharide Capsule
RNA
None
The Hershey-Chase experiment provided definitive evidence that DNA is the genetic material. Which of the following best describes their experimental approach?
Observing bacterial transformation using purified protein extracts
Analyzing the chemical composition of chromosomes
Radioactively labeling phage DNA and protein to track their fate during infection
Studying the inheritance patterns of mutant bacteria
