Which is the correct pair of complementary nitrogenous bases in DNA?

Which is the correct pair of complementary nitrogenous bases in DNA?


2. it could be double stranded DNA molecule or a ladder that is twisted.‍♀️ and I think 1. is covalent and hydrogen.

(dont worry I searched them up on google)

A ) adenine and thymine


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.  



Each nucleotide base can hydrogen-bond with a specific partner base in a process known as complementary base pairing: Cytosine forms three hydrogen bonds with guanine, and adenine forms two hydrogen bonds with thymine. These hydrogen-bonded nitrogenous bases are often referred to as base pairs.


strands of phosphate sugar backbone with complementary nitrogenous base pairs bound into a double helix

Adenine and thymine pair up. Just remember ATCG in that order, showing that adenine and thymine pair up, and so do cytosine and guanine
Answer - A
Adenine pairs up with thymine, and cytosine pairs up with guanine.
It would be the first option. Adenine and thymine.
The first one is correct. A always pairs with T, and C always pairs with G
They form hydrogen bonds between opposing dna which forms the twister ladder of dna

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