Discovery Of DNA Warm Up 1

The correct answer is "Heat" because Frederick Griffith concluded that the factor responsible for killing the Streptococcus pneumoniae bacteria in his experiments was heat. This implies that heat had a detrimental effect on the bacteria, causing their death.

The experiment conducted by Hershey and Chase provided evidence that DNA is the hereditary material. They used bacteriophages, which are viruses that infect bacteria, to investigate whether DNA or protein was responsible for carrying genetic information. They labeled the DNA of the bacteriophages with radioactive phosphorus and the protein with radioactive sulfur. After infecting the bacteria with the labeled bacteriophages, they found that only the radioactive DNA was transferred to the next generation of bacteriophages, indicating that DNA, not protein, carries the genetic information. Therefore, the correct statement is that DNA is the hereditary material.

Chase and Hershey set out to test whether DNA or protein was the hereditary material viruses transfer when entering a bacterium.

The Hershey-Chase Experiment used bacteriophages to determine whether DNA or protein is the genetic material of a virus. The target bacteria for this experiment was Escherichia coli, as it is a commonly studied bacterium and was easily infected by the bacteriophages used in the experiment. By labeling the DNA and protein of the bacteriophages with different radioactive isotopes, Hershey and Chase were able to demonstrate that the DNA, not the protein, was the genetic material that was transferred to the bacteria during infection.

Sulfur-35 is the correct answer because it is a radioactive isotope that is commonly used to label proteins. Radioactive labeling is a technique used to track and study the movement and behavior of proteins within cells. Sulfur-35 can be incorporated into proteins during their synthesis, allowing researchers to track the protein's location and activity.

Phosphorus-32 is used to label DNA. Phosphorus is an essential element in DNA molecules, and the isotope Phosphorus-32 is commonly used in molecular biology research to label DNA. This isotope emits beta particles, which can be detected and used to track the movement and behavior of DNA in experiments.

The S. strain of Streptococcus pneumoniae is harmful to humans.

The correct answer is E and F strain because the question asks for a strain of Streptococcus pneumoniae that is not included in the options. The options include S. strain, E. strain, R. strain, F. strain, and E and F strain. Since E and F strain is included in the options, it cannot be the correct answer.

Bacteriophages do not contain DNA labeled with radioactive sulfur-35. Bacteriophages are viruses that infect bacteria, and their genetic material can be either DNA or RNA. Radioactive labeling is a technique used to track molecules in experiments, but it is not a characteristic of bacteriophages. Therefore, the statement is false.

In the given experiments, Frederick Griffith injected mice with different types of cells. The S cells are known to be virulent and can cause disease, while the R cells are non-virulent. The experiment that resulted in the death of the mice is when live S cells were injected. This is because the live S cells are capable of causing an infection and leading to the death of the mice.