Which of the following statements best describes why the sugar phosphate nucleic
ID: 586230 • Letter: W
Question
Which of the following statements best describes why the sugar phosphate nucleic acid backbone is on the outer part of the DNA double helix while the nitrogen bases are on the inside of the double helix? A) The sugar phosphate backbone is hydrophilic while the bases are hydrophobic. B) The sugar phosphate backbone is hydrophobic while the bases are hydrophilic. C) The sugar phosphate backbones of the two strands are bonded together D) The nitrogen bases are covalently bonded to each other. E) There is no reason; the structure is just that wayExplanation / Answer
The sugar phosphate back bone of DNA is hydrophilic while the bases are hydrophobic.
The outer part of the DNA douyble helical structure made of an alternate arrangement of sugar and phospahate by means of covalent linkages. The hydroxyl group The hydroxyl groups of the sugar participates in hydrogen bonding with water. The base pairs of DNA are adenine (A), thymine (T), guanine and (G) cytosine (C), where, A binds with T and G binds with C binds by means of hydrogen bonding, which gives stability to the internal structure. The twisting of sugar phospahte back bone protects the base present inside of the helical structure.
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