r7andrunaaleigm r7andrunaaleigm

08-08-2016
Biology

Answered

If a DNA double helix is gradually heated, which bonds in the molecule will break first (are the weakest)?

Abonds between the nitrogenous bases
Bbonds between the bases and the sugars
Cbonds between the sugar and phosphate within a nucleotide
Dbonds between the sugar and phosphate of adjacent nucleotides

Verified Answer :

23-08-2017

A is the correct answer. Chemical bonds can be classified as strong or weak. Van der Waals bonds (attractions) are weak and ionic or covalent bonds are strong. The bonds between bases, sugars and phosphates (answers B, C and D) are all covalent and are strong. The bonds between two bases, answer A, are weak van der Waals bonds.

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mlevans0926 mlevans0926

16-10-2018

The answer is A. bonds between the nitrogenous bases

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