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 eh6 k 6b9tq5hbk el*u +afmg.y5xperimei fh ea7kdlnt*/ da*41nt conducted by a team of researchers investigating the relationship between the composition and melting point1dfh4/ta da7n**ei kl of different DNA samples. At the melting point, the DNA double helix separates into two individual strands.

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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