One of the pyrimidine bases is absent in DNA:
Correct answer: A. Uracil
- A. Uracil
- B. Thymine
- C. Cytosine
- D. Adenine
Explanation
[A] Uracil is a pyramiding present in RNA but not in DNA[B] Thymine(pyrimidine) is present in DNA[C] Cytosine(pyrimidine) is also present in DNA[D] Adenine is a purine present in DNA
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Structure of DNA
DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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