EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 13.1, Problem 2R
Summary Introduction
To review:
The experiments performed by Avery and other colleagues that depicted that proteins were not the genetic material.
Introduction:
In the year 1928, Griffith discovered that when heat-killed smooth strain (S) was mixed with the rough strain (R) and injected in mice, the mice died. It meant that something was getting transferred from the heat-killed virulent (S) cells to the avirulent (R) cells. This came to be known as the transforming principle. Griffith did not know the biochemical nature of this transforming principle. Therefore, in 1944, Avery, McCarty, and MacLeod did experiments to find out the chemical nature of the same.
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Explain how Avery-MacLeod-McCarty experiment discovered that DNA is the genetic material.
How did Griffith’s work provide a foundation for the experiments of Avery and his colleagues pointing to DNA as the essential genetic material?
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- Does the design of the Hershey–Chase experiment distinguish between DNA and RNA as the molecule serving as the genetic material? Why or why not?arrow_forwardIn detail explain the experiment that helped Hershey and Chase recognize DNA as a genetic materialarrow_forwardHow griffin's experiment helps in the identification of DNA as the genetic material?arrow_forward
- If RNA were the universal genetic material, how would this have affected the Avery experiment and the Hershey–Chase experiment?arrow_forwardDescribe one of the experiments that helped to solve the puzzle concerning the nature of the genetic material.arrow_forwardDescribe the “blender experiments” of Hershey and Chase and what they revealed about DNA versus protein?arrow_forward
- How did Hershey and Chase differentiate between DNA and protein intheir experiment while proving that DNA is the genetic material?arrow_forwardWhy wasn’t James Watson punished by the scientific community once more was learned about how he obtained the critical data needed to come up with the structure of DNA?arrow_forwardYou have a sample of genetic material. The nitrogenous base content is 29% guanine. a) If the sample is DNA, what are the amounts of the other bases? Explain your thought process b) Why can you not determine the amounts of the other bases if the sample is RNA? Explain your answer c) How did Watson and Crick make use the relationships between base pairs as they constructed the model for DNA?arrow_forward
- According to the Watson- Crick model how many polynucleotide chains does a DNA molecule have?arrow_forwardGiven the state of knowledge at the time of the Avery, MacLeod,and McCarty experiment, why was it difficult for some scientiststo accept that DNA is the carrier of genetic information?arrow_forwardwhat are the CONTRIBUTIONS OF OSWALD AVERY AND FEDERICK GRIFFITH TO THE DISCOVERY OF DNA? what are their other accomplishments?arrow_forward
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