Literature review

 

 

 

 

 

Read Hershey and Chase 1952 (file I attached), then please answer for the questions
1. What is phage? What component of the phage does S35 represent? What component does P32 represent?
What is the significance of its separation into ghosts and DNA?
2. What is the difference between absorption and adsorption, in the context of this experiment?
3. How did the introduction of treatment variables ‘running time in blender’ and ‘multiplicity of infection’
influence the conclusions drawn by the authors?
4. What is the significance of the finding that phage sulfur takes no part in manufacture of intracellular phage?

 

 

 

Sample Solution

Literature review

The Hershey-Chase experiments were a series of experiments conducted in 1952 by Alfred Hershey and Martha Chase that helped to confirm that DNA is a genetic material. They performed their experiments on viruses that infect bacteria, also called bacteriophages. Phages are viruses that infect bacteria. They infects the bacteria by injecting its genes [DNA or RNA]. They kill bacteria by making them burst or lyse. S35 represents the protein, which makes up the exterior of the phage. Hersey and Chase grew some bacteriophages on a medium containing radioactive phosphorus [P32] to identify DNA and some on a medium containing radioactive Sulphur [S35] to identify protein. These radioactive-labelled phages were allowed to infect E.colli bacteria subjected to the process of centrifugation. Hershey and Chase concluded that protein was not genetic material, and that DNA was genetic material. The Hershey-Chase experiments mostly ended scientists’ suspicions that genes were made of protein rather than DNA.

wo children were both in a Teaching Family Model group home and both have been institutionalized there for a little over seven years (McGee et al., 1983). One of the participants was fifteen years old, and the other participant was twelve years old (McGee et al., 1983). Incidental teaching occurred daily in the kitchen for a 45-minute session in the kitchen during preparation for lunches (McGee et al., 1983). The teacher would ask the student, “Are you ready to make sandwiches?” or a similar question to inquire readiness (McGee et al., 1983). When the child looked at the teacher without any off task or self-stimulatory behavior, the teaching procedure was initiated and the incidental teaching began (McGee et al., 1983). There was also generalization in the study across settings, just as standard incidental teaching, but only modified to aid the severe deficits in the children. The results yielded benefits that are similar to that of standard incidental teaching procedures because if the rapid acquisition and the promotion of generalization (McGee et al., 1983).

At times it is difficult to use prompts when teaching children with ASD new skills because they can be prompt dependent; however, it is difficult to not use any prompts because they are needed to teach the skill. Incidental teaching is a procedure, which aids the children to learn the skills in a natural environment, but there also isn’t a need for continual prompts (Hart and Risley, 1975). McGee et al. (1999) showed that incidental teaching generates less prompt dependency because the teacher prompts them to elaborate on that initiation, rather than starting with a word that was chosen randomly by the teacher that does not hold the child’s interest. It is important to have at least a prompt level system in placed in order to maintain a procedure that is not prompt dependent (McGee et al., 1986). Incidental teaching also generalizes across different settings and people without prompt dependence. The study completed by McGee and Daly (2007) showed that the social phrases learned in their study by the three autistic boys were transferred across different periods and situations without prompts. According to McGee et al. (1999) the strong interest and favor to incidental teaching was due to the need to overcome the

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