Which one among the following is double ring structure?
Correct answer: C. Guanine
- A. Cytosine
- B. Thymine
- C. Guanine
- D. Uracil
Explanation
Cytosine, thymine, and guanine are nitrogenous bases found in DNA and RNA. These bases have a single ring structure, not a double ring structure. Adenine and guanine have a double ring structure, while cytosine and thymine have a single ring structure. These bases play a crucial role in the genetic code and the formation of DNA and RNA molecules.
This question appeared on the KMU Centralized Admission Test 2021 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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