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kenny6666 [7]
3 years ago
11

In order to explain DNA's consistent width, Watson and Crick concluded that

Biology
2 answers:
Kipish [7]3 years ago
5 0
The answer is C. Purines (A and G) have double-ring structure while pyrimidines (C and T) have single rings. The obligate complimentary base pairing between a purine and pyrimidine ensures that the width between the helix backbones are maintained at approximately 20 angstroms.
natita [175]3 years ago
3 0
<h3><u>Answer;</u></h3>

C. one single ring base will always bond with one double ring base.

<h3><u>Explanation;</u></h3>
  • At first, Watson and Crick thought the bases paired such that a like base pairs with its like (A with A, and so on), but such pairings did not result in a uniform width.
  • <em><u>Instead, pairing a purine with a pyrimidine resulted in a uniform width consistent with the X-ray data.</u></em>
  • Each base pair forms a different number of hydrogen bonds. Adenine and thymine form two hydrogen bonds, cytosine and guanine form three hydrogen bonds
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