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ohaa [14]
3 years ago
12

Which is the correct pair of complementary nitrogenous bases in DNA?. A ) adenine and thymine . B ) cytosine and thymine. C ) gu

anine and thymine. .
Biology
2 answers:
Tresset [83]3 years ago
8 0
Answer - A
Adenine pairs up with thymine, and cytosine pairs up with guanine.
zzz [600]3 years ago
6 0

Answer:

A ) adenine and thymine

Explanation:

DNA has two types of nitrogenous bases: purines and pyrimidines. Adenine and guanine are purines while cytosine and thymine are pyrimidines.  

A purine always pairs with a pyrimidine. Hence, adenine in DNA pairs with thymine while guanine pairs with cytosine. This is done to maintain the constant width of the double helix throughout the length.  

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