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  • Which nitrogenous base is NOT found in DNA?Option: 1 AdenineOption: 2 <p d

Which nitrogenous base is NOT found in DNA?

Option: 1

Adenine


Option: 2

Guanine


Option: 3

Uracil

 


Option: 4

 Thymine


Answers (1)

best_answer

In DNA the nucleotides are joined by phosphodiester bonds to form polynucleotide strands. The two strands in DNA are complementary and antiparallel. The Structure of DNA is stabilized by hydrogen bondings between the complementary base pairs in DNA. DNA has nitrogen bases namely purines - adenine, guanine, pyramidines - thymine and cytosine. Uracil is absent. The complementary base pairing in DNA is adenine (A) with thymine (T) and guanine (G) with cytosine (C). Hence option 3 is the correct answer.

Option(1) DNA has nitrogen bases namely purines - adenine, guanine, pyramidines - thymine and cytosine. Uracil is absent.  Hence option 1 is incorrect.

Option(2)  DNA has nitrogen bases namely purines - adenine, guanine, pyramidines - thymine and cytosine. Uracil is absent. Hence option 2 is incorrect.

Option(4) DNA has nitrogen bases namely purines - adenine, guanine, pyramidines - thymine and cytosine. Uracil is absent.  Hence option 4 is incorrect.

Posted by

Suraj Bhandari

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