The Following Questions Refer to the Information Below -When Sufficient Heat Is Applied, Double-Stranded DNA Denatures into Two

question 90

Short Answer

The following questions refer to the information below.
A researcher compared the nucleotide sequences of a homologous gene from five different species of mammals with the homologous human gene. The sequence homology between each species' version of the gene and the human gene is presented as a percentage of similarity.
$$\begin{array} { l c } \text { Species } & \text { Percentage } \\\hline \text { Chimpanzee } & 99.7 \\\text { Orangutan } & 98.6 \\\text { Baboon } & 97.2 \\\text { Rhesus Monkey } & 96.9 \\\text { Rabbit } & 93.7\end{array}$$

-When sufficient heat is applied, double-stranded DNA denatures into two single-stranded molecules as the heat breaks all of the hydrogen bonds. In an experiment, molecules of single-stranded DNA from species X are separately hybridized with putatively homologous single-stranded DNA molecules from five species (A-E). The hybridized DNAs are then heated, and the temperature at which complete denaturation occurs is recorded. Based on the data below, which species is probably most closely related to species X?
$\begin{array}{cc}&\text { Temperature at Which } \\\text { Species } & \begin{array}{c}\text { Hybridized DNA Denatures }\end{array} \\\hline \text { A } & 30^{\circ} \mathrm{C} \\\text { B } & 85^{\circ} \mathrm{C} \\\text { C } & 74^{\circ} \mathrm{C} \\\text { D } & 60^{\circ} \mathrm{C} \\\text { E } & 61^{\circ} \mathrm{C}\end{array}$

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