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Why can’t two pyrimidines be paired with one anothr ?
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Why can’t two pyrimidines be paired with one anothr ?

User Irfan Ashraf
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Answer:

There are two reasons for this. The first reason is that the distance between the two strands of DNA is constant. Two purines together would be too big to fit in that distance, and two pyrimidines together would be too small. The second reason is that the bonding between purines and pyrimidines is very specific.

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User Hluk
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