Unity and Diversity A.2 Nucleic Acids (id: b4bc4cd30)

本题目来源于试卷: Unity and Diversity A.2 Nucleic Acids，类别为 IB生物学

[单选题]
The graph below shows the results of an experiment cy8zm b;ll +v9vli/5mv onducted by abw 38/ thkq0 ijruf m(j;5af7h team of researchers investigating the relationship between the composition and melting point of different DNA samples. At the melting point, the DNA double helix separates into two individual stru bqhfj(ka5m; f hj7w83 i/rt0ands.

Two DNA samples were compared, one consisting of only PQ pairs and another one consisting of only RS pairs. Letters P, Q, R and S represent different nitrogenous bases found in the DNA.


Based on the results presented in the graph, and your knowledge of nucleotide base pairing (between purines and pyrimidines), deduce which nitrogenous bases correspond to the letters P, Q, R and S.

A. $P$ is Cytosine;Q is Guanine;R is Thymine;S is Adenine
B. $P$ is Adenine;Q is Cytosine;R is Guanine;S is Thymine
C. $P$ is Guanine;Q is Adenine;R is Thymine;S is Cytosine
D. $P$ is Thymine;Q is Adenine;R is Cytosine;S is Guanine


参考答案:  D


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