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Question: a double stranded segment of dna 750 nucleotides long each...

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A double stranded segment of DNA 750 nucleotides long (each strand) has a guanine content of 32%. The strands of this segment of DNA can be separated by temperatures above 88.6oC. A second double stranded segment of DNA that is also 750 nucleotides long contains 44% guanine and undergoes strand separation at 94.5oC. Which of the following explain why the two segments of DNA separate at different temperatures:

A. adenine-guanine base pairs form two peptide bonds B. adenine-thymine base pairs form two covalent bonds C. cytosine-guanine base pairs form two peptide bonds D. cytosine-guanine base pairs form two hydrogen bonds E. adenine-thymine base pairs form three peptide bonds AB. cytosine-adenine base pairs form three hydrogen bonds AC. cytosine-guanine base pairs form three hydrogen bonds AD. adenine-guanine base pairs form three covalent bonds AE. cytosine-thymine base pairs form three ionic bonds BC. adenine-thymine base pairs form three ionic bonds BD. none of the above are correct

please explain why as well

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