Following is the structure of:
Correct answer: D. Cytosine
- A. Uracil
- B. Thymine
- C. Guanine
- D. Cytosine
Explanation
The given structure is of a pyrimidine base which bears resemblance to the structure of Cytosine.
This question appeared on the UHS MDCAT 2017 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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