GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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protein and DNA are the hereditory materials of viruses
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protein, not DNA, is the hereditary material of viruses
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viruses do not contain hereditary material
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DNA, not protein, is the hereditary material of viruses.
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Detailed explanation-1: -Conclusion of Hershey and Chase Experiment: The bacteria that had been infected by the virus and coated with a radioactive protein coat were not radioactive, demonstrating that DNA is the genetic material transmitted from a virus to a bacteria.
Detailed explanation-2: -In their experiments, Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not. Hershey and Chase and subsequent discoveries all served to prove that DNA is the hereditary material.
Detailed explanation-3: -Hershey and Chase concluded that protein was not genetic material, and that DNA was genetic material.
Detailed explanation-4: -Conclusion: Resultant radioactive and non-radioactive bacteria infer that the viruses that had radioactive DNA transferred their DNA to the bacteria but viruses that had radioactive protein didn’t get transferred to the bacteria. Hence, DNA is the genetic material and not the protein.
Detailed explanation-5: -How did the Hershey and Chase experiment produce evidence that DNA, and not protein, is the hereditary material in viruses? they found all of the viral DNA and little of the protein had entered ecoli cells. then they concluded that DNA is the hereditary molecule in viruses.