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 of a DNA fragment. Which b7ofz- iuje0/jw-h4t londs easily breakq9n44 no9w vdj and reform?oqw 44njv9dn 9

A.
B.
C.
D.


参考答案:  B


本题详细解析:
There are covalent bonds between the phosphate and sugar and betweenlg + 24,n87a n3 ofxanubxc*kf 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 reform easily. (Choice B)The nitrogenous bases consist of single and double covalent bonds (Choice Abf*+xk8o 23xn4, n 7ugal nfca) 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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