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Exam 17: Viruses

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Question 21

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You isolate an infectious substance that is capable of causing disease in plants,but you do not know whether the infectious agent is a bacterium,virus,or prion.You have four methods at your disposal that you can use to analyze the substance in order to determine the nature of the infectious agent. I.Treat the substance with nucleases that destroy all nucleic acids and then determine whether it is still infectious. II.Filter the substance to remove all elements smaller than what can be easily seen under a light microscope. III.Culture the substance by itself on nutritive medium,away from any plant cells. IV.Treat the sample with proteases that digest all proteins and then determine whether it is still infectious. If you already knew that the infectious agent was either bacterial or viral,which treatment listed above would allow you to distinguish between these two possibilities?

A) I
B) II
C) III
D) IV

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Question 22

Multiple Choice

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A bacterium is infected with an experimentally constructed bacteriophage composed of the T2 phage protein coat and T4 phage DNA.The new phages produced would have

A) T2 protein and T4 DNA.
B) T4 protein and T2 DNA.
C) T2 protein and T2 DNA.
D) T4 protein and T4 DNA.

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Question 23

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Which of the following nucleic acids make(s) up viral genomes?

In 1971,David Baltimore described a scheme for classifying viruses based on how the virus produces mRNA,referred to as the Baltimore requirements.The table below shows the results of testing five viruses (A-E) for nuclease sensitivity,the ability of the viral genome to act as an mRNA,and the presence (+) or absence (-) of each virus's own polymerase. Based on the table above,which virus meets the requirements for a bacteriophage?

Which of the following statements correctly describes adenoviruses?

-Which of the three types of viruses shown in the figure above would you expect to include glycoproteins as part of their overall structure?

Which of the following responses correctly lists the order of events in a generalized viral replicative cycle?

How do antiviral drugs help to treat viral infections?

You isolate an infectious substance that is capable of causing disease in plants,but you do not know whether the infectious agent is a bacterium,virus,or prion.You have four methods at your disposal that you can use to analyze the substance in order to determine the nature of the infectious agent. I.Treat the substance with nucleases that destroy all nucleic acids and then determine whether it is still infectious. II.Filter the substance to remove all elements smaller than what can be easily seen under a light microscope. III.Culture the substance by itself on nutritive medium,away from any plant cells. IV.Treat the sample with proteases that digest all proteins and then determine whether it is still infectious. If you already knew that the infectious agent was a prion,which treatment listed above would allow you to distinguish this?

Which of the following characteristics,structures,or processes is common to both bacteria and viruses?

Some people who have had a herpesvirus-mediated cold sore or genital sore may have flare-ups for the rest of their life.Why does this occur?

Which of the following statements correctly describes the best predictor of how much damage a virus causes?

Which of the following processes can be effective in preventing the onset of viral infection in humans?

Which of the following statements accurately describes plant virus infections?

Which of the following characteristics determine a virus's host range?