Test: MCAT Biology

1.

DNA is comprised of a double-stranded helix in which purine bases are paired with pyrimidine bases. Which base pairing requires more energy to separate?

Adenine and thymine because they are paired by three hydrogen bonds

Adenine and thymine because they are paired by covalent bonds

Guanine and cytosine because they are paired by three hydrogen bonds

Guanine and cytosine because they are paired by covalent bonds

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