Which base pair is Cytosine-Guanine?

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Multiple Choice

Which base pair is Cytosine-Guanine?

Explanation:
In DNA, bases pair in a way that keeps the double helix width uniform and lends stability through hydrogen bonding. Cytosine pairs with guanine because their structures form complementary hydrogen-bonding patterns and fit together tightly, resulting in three hydrogen bonds that strengthen the GC pair. This GC pairing contrasts with A–T in DNA (two hydrogen bonds) and with RNA where uracil replaces thymine. Uracil–guanine is not a standard base pair. So Cytosine-Guanine is the canonical GC base pair.

In DNA, bases pair in a way that keeps the double helix width uniform and lends stability through hydrogen bonding. Cytosine pairs with guanine because their structures form complementary hydrogen-bonding patterns and fit together tightly, resulting in three hydrogen bonds that strengthen the GC pair. This GC pairing contrasts with A–T in DNA (two hydrogen bonds) and with RNA where uracil replaces thymine. Uracil–guanine is not a standard base pair. So Cytosine-Guanine is the canonical GC base pair.

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