weir9y6nellazos weir9y6nellazos

31-08-2016
Biology

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

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MysteriousGamer MysteriousGamer

01-09-2016

Answer - A
Adenine pairs up with thymine, and cytosine pairs up with guanine.

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ArnimZola ArnimZola

02-07-2019

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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