You have analyzed the base composition of the genetic material in a virus and found the following: 32% adenine, 17% thymine, 18% guanine, and 33% cytosine. From this analysis, which of the following is the most likely structure of the viral genome?

Question

You have analyzed the base composition of the genetic material in a virus and found the following: 32% adenine, 17% thymine, 18% guanine, and 33% cytosine.  From this analysis, which of the following is the most likely structure of the viral genome?

BlackTom AI · Accepted Answer

To determine the structure of the viral genome, we analyze the base composition provided: 32% adenine (A), 17% thymine (T), 18% guanine (G), and 33% cytosine (C). In double-stranded DNA, the principle of complementary base pairing dictates that the percentage of adenine should equal thymine (A = T), and guanine should equal cytosine (G = C). Here, A ≠ T and G ≠ C, which immediately rules out double-stranded DNA as a possibility.

For double-stranded RNA, the complementary base pairing rule also applies, with adenine pairing with uracil (U) instead of thymine, and guanine pairing with cytosine. However, the presence of thymine in the composition indicates that the nucleic acid is DNA, not RNA. Therefore, double-stranded RNA is not a viable option.

Single-stranded RNA is also ruled out because RNA does not contain thymine; instead, it contains uracil. The presence of thymine in the composition confirms that the genetic material is DNA, not RNA.

The only remaining option is single-stranded DNA. In single-stranded DNA, there is no requirement for equal base pairing, allowing for the observed unequal percentages of adenine, thymine, guanine, and cytosine. Thus, the most likely structure of the viral genome, given the base composition, is single-stranded DNA.

You have analyzed the base composition of the genetic material in a virus and found the following: 32% adenine, 17% thymine, 18% guanine, and 33% cytosine. From this analysis, which of the following is the most likely structure of the viral genome?单项选择题

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