Which of the following is not a pyrimidine base?

  • Option 1)

    Thymine 

  • Option 2)

    Guanine 

  • Option 3)

    Cytosine 

  • Option 4)

    Uracil 

 

Answers (2)

As discussed in

Deoxyribonucleic acid (DNA) -

Made up of nucleotides consisting of pentose sugar which is \beta-D-2- deoxyribose, Phosphoric acid and bases (Adenine , Guanine , cytosine and thymine)

-

 

 and

Ribonucleic acid (RNA) -

Made up of nucleotides consisting of pentose sugar which is \beta-D-ribose, Phosphoric acid and bases (Adenine , Guanine , cytosine and uracil)

-

 

Purines (Adenine and guanine) and pyrimidines (thymine, cytosine and uracil) are the constituents of DNA and RNA.


Option 1)

Thymine 

This solution is incorrect.

Option 2)

Guanine 

This solution is correct.

Option 3)

Cytosine 

This solution is incorrect.

Option 4)

Uracil 

This solution is incorrect.

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