Unity and Diversity A.2 Nucleic Acids (id: 6230c4cfd)

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 diagram shows the structure o,y 4et:r0 bbc :5 sklx4rsu:tpmjq:r4f a DNA frac2c8c-ikaa 4cap5 0e8rcd6 d2t4dtc rgment. Which bonds easily break and refdtc cca-26ekacarpicd5d24 tr048 c 8orm?

A.
B.
C.
D.


参考答案:  B


本题详细解析:
There are covalent bonds bet/a)mxs 6tzu :kween the phosphate and sugar and between the phosphate and base. Covalent bonds do not typically break and reform easily. (Choice D)The bonds between the nitrogenous bases holding the two strands together are hydrogen bonds. Hydrogen bonds typically break and rex z)ka :sm6/tuform easily. (Choice B)The nitrogenous bases consist of single and double covalent bonds (Choice A) between nitrogen and carbon atoms. Deoxyribose sugar consists of single covalent bonds (Choice C) between the carbon atoms forming the pentose sugar. Covalent bonds do not typically break and reform easily.

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