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Which kinds of forces stabilize the DNA structure?

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Which kinds of forces stabilize the DNA structure?

(a) hydrophilic, covalent

(b) hydrophobic, covalent

(c) hydrophobic, van der Waals

(d) hydrophilic, van der Waals

The question was posed to me in an online quiz.

This key question is from Gene Chemical Nature in section Nature of Genome of Cell Biology

1 Answer

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Correct choice is (c) hydrophobic, van der Waals

The explanation: The bases occupy planes that are perpendicular to the long axis of the molecule and are stacked one on top of the other. The hydrophobic interactions and van der Waals forces between the bases stabilize the entire DNA molecule.

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