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Which is the best explanation for why adenine matches with thymine, and guanine matches with cytosine?
1.)The bases only have a set number of available bonds
2.)There is a specific order that they go in
3.)They are antiparallel
4.)They have magnets in them

Respuesta :

Kemor
The answer here is #1

Each DNA bases match with a specific kind because of the chemical structure of each base. To this end, they must be complementary to fit.

Adenine and Thymine produce two bonds between them, while Guanine and Cytosine achieve three hydrogen bonds.
wittysharky22

The best explanation for why adenine bonding with thymine only and guanine with cytosine only is through the base pairing rule in DNA where the bases only have a set of available bonds to allow complementary base pairing, where each base can only bond with a specific base partner. These hydrogen-bonded nitrogenous bases are called base pairs. In complementary base pairing, cytosine can make three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine. The structures complement each other like a lock and a key system. 

It can be observed in the structure of these nitrogenous bases that purines have an imidazole ring attached to the pyrimidine ring in their structure. A purine has to make a hydrogen bond with another pyrimidine because there is only enough space between the two strands to accommodate a purine and a pyrimidine. Therefore, two purines will not fit between the strands while two pyrimidines will be too far to bond. 

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