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Home Q & A Board Biology-Related Homework Help Cell Biology
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juli3_jon3s juli3_jon3s
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11 years ago
why can't cytosine pair up with adenine or thymine with guanine?
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#1
11 years ago
this is actually incorrect..

Adenine pairs up with Thymine

Guanine pairs up with Cytosine..

The reason for this is hydrogen bonding - it will help if you understand the structure of these bases but basically Adenine and Thymine make two hydrogen bonds and thus go together, whereas gunanine and cytosine make 3 each.
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