Blog

Which of the following was not made clear by the Tuskegee Syphilis Study?

Stonewall Riots

Which of the following claims would advocates of full disclosure to patients likely appeal to in support of their position?

The ____________________ gives autonomous persons the authority to control who may possess and use information about them.

The battle of Dien Bien Phu

House Un-American Activities Committee

A particular triplet of bases in the template sequence of DNA is 3’−CAT−5′. The anticodon component of the tRNA that binds the mRNA codon from this DNA is which of the following? Note: By convention for tRNA, the 3′ end of each anticodon is written on the left, 5′ on the right.

In 1952, Hershey and Chase ran a number of experiments. One experiment is diagrammed below. Overall, the experiments had the same basic steps: Step 1: Phages, which are viruses that infect bacteria, are grown with either radioactive sulfur, which will label proteins, or grown with radioactive phosphorus, which will label DNA. Step 2: Bacterial cells were infected with the Phages. Phages, like viruses, inject something into the bacterial cell to infect it. They wanted to determine whether proteins or DNA are injected from the phage to infect the bacterial cell.  Step 3: After infection, the cells are placed in a blender to remove the phage from the bacterial cells.  Step 4: The mixture is spun down, or centrifuged, so that the phage and the bacteria are completely separated. The bacteria will end up at the bottom of the test tube in what is known as a pellet. Whatever the phage injected into the bacterial cell will therefore end up in the pellet. In contrast, the phage will remain in the solution and remain at the top of the test tube in what is known as the supernatant.  Step 5: Radioactivity will then be measured. If radioactivity remains in the supernatant, it was not injected to infect the bacterial cell and is not the genetic information passed on. If the radioactivity is found in the pellet with the bacterial cell, it was injected into the cell as the infectious genetic material.  Given the diagram of the experiment below, what was found? Hershey–Chase Experiment Image Description A diagram showing the step-by-step process of the 1952 experiment by Hershey and Chase. First, phages are grown with radioactive material. Next, the phages are injected into the bacteria cells. Subsequently, the bacteria are blended to remove the phages. The mixture is spun to separate the bacteria. Finally, the radioactivity of the bacteria is measured.

Frederick Jackson Turner’s Frontier Thesis

 _________________________ is a moral model according to which the prime duty of humans is to guide their lives towards their natural ends.