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The illustration depicts the deoxyribonucleic acid double helix. 

DNA contains four nitrogenous bases: Adenine, cytosine, guanine, and thymine.

The base pairing are always as follows:

    · adenine with thymine
    · cytosine with guanine

Answer:
D) thymine

Answer: d thymine

Explanation:

Adenine always pair with thymine to make double stranded structure of the DNA. Adenine can form two hydrogen bonds with thymine only. Each base in DNA can only bond with specific base molecule and the base pairing is called as complementary base pairing.

Same the cytosine form three hydrogen bond and paired with guanine only.

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