Use the Following Information to Answer the Following Questions -Given Baltimore's Scheme, a Positive Sense Single-Stranded RNA Virus Such

question 34

Multiple Choice

Use the following information to answer the following questions.
In 1971, David Baltimore described a scheme for classifying viruses based on how the virus produces mRNA.
The table below shows the results of testing five viruses for nuclease specificity, the ability of the virus to act as an mRNA, and presence (+) or absence (-) of its own viral polymerase.
$\begin{array}{ll}\text { Virus Nuclease } & \text { Sensitivity } &\text { Genome as mRNA}&\text { Polymerase} \\A & \text { Dnase }&-&+ \\\mathrm{B} & \text { Rnase }&+&- \\\mathrm{C} & \text { Dnase } &-&+\\\mathrm{D} & \text { Rnase }&-&+ \\\mathrm{E} & \text { Rnase }&+&-\end{array}$
-Given Baltimore's scheme, a positive sense single-stranded RNA virus such as the polio virus would be most closely related to which of the following?

• A)T-series bacteriophages
• B)retroviruses that require a DNA intermediate
• C)single-stranded DNA viruses such as herpesviruses
• D)nonenveloped double-stranded RNA viruses
• E)linear double-stranded DNA viruses such as adenovirus

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