Question

The relative amounts of each nudeotide base are tabulated here for four different viruses. For each virus listed in the following table, indicate whether its genetic material is DNA or RNA and whether it is single stranded or double stranded. Explain your reasoning. $$\begin{array}{cccccc} \text { Virus } & \mathbf{T} & \mathbf{C} & \mathbf{U} & \mathbf{G} & \mathbf{A} \\ \mathbf{I} & 0 & 12 & 9 & 12 & 9 \\ \text { II } & 23 & 16 & 0 & 16 & 23 \\ \text { III } & 34 & 42 & 0 & 18 & 39 \\ \text { IV } & 0 & 24 & 35 & 27 & 17 \end{array}$$

   The relative amounts of each nudeotide base are tabulated here for four different viruses. For each virus listed in the following table, indicate whether its genetic material is DNA or RNA and whether it is single stranded or double stranded. Explain your reasoning.
$$\begin{array}{cccccc}
\text { Virus } & \mathbf{T} & \mathbf{C} & \mathbf{U} & \mathbf{G} & \mathbf{A} \\
\mathbf{I} & 0 & 12 & 9 & 12 & 9 \\
\text { II } & 23 & 16 & 0 & 16 & 23 \\
\text { III } & 34 & 42 & 0 & 18 & 39 \\
\text { IV } & 0 & 24 & 35 & 27 & 17
\end{array}$$

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Genetics: A Conceptual Approach

Genetics: A Conceptual Approach

Benjamin Pierce 5th Edition

Chapter 10, Problem 35

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Solved by Expert Parvati Devi

10/09/2021

Step 1

This can be done by looking at the presence of Thymine (T) or Uracil (U). If Thymine is present, it indicates DNA and if Uracil is present, it indicates RNA. Show more…

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The relative amounts of each nudeotide base are tabulated here for four different viruses. For each virus listed in the following table, indicate whether its genetic material is DNA or RNA and whether it is single stranded or double stranded. Explain your reasoning. $$\begin{array}{cccccc} \text { Virus } & \mathbf{T} & \mathbf{C} & \mathbf{U} & \mathbf{G} & \mathbf{A} \\ \mathbf{I} & 0 & 12 & 9 & 12 & 9 \\ \text { II } & 23 & 16 & 0 & 16 & 23 \\ \text { III } & 34 & 42 & 0 & 18 & 39 \\ \text { IV } & 0 & 24 & 35 & 27 & 17 \end{array}$$

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Key Concepts

DNA vs RNA Distinction

This concept refers to the differences in nucleotides that make up DNA and RNA. DNA contains thymine while RNA contains uracil, and this difference is critical when identifying the type of genetic material based solely on the base composition. The presence or absence of these bases helps to distinguish one from the other in various organisms and viruses.

Complementary Base Pairing

Complementary base pairing is a fundamental principle of nucleic acid structure where specific nucleotides pair with each other (adenine with thymine in DNA or with uracil in RNA, and guanine with cytosine). In double-stranded molecules, this pairing results in equivalent amounts of complementary bases. Recognizing this pattern is essential to deduce if a nucleic acid strand is part of a double helix.

Single-Stranded vs Double-Stranded Determination

This key concept involves using the symmetry or balance of base ratios to infer whether the nucleic acid is single-stranded or double-stranded. In double-stranded molecules, complementary bases usually occur in equal or nearly equal amounts, following Chargaff's rules, whereas imbalances in base composition may indicate a single-stranded nature.

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