Purines are _ nitrogenous bases.
Correct answer: A. Double ringed
- A. Double ringed
- B. Single ringed
- C. Double bond
- D. Single bond
Explanation
Purines are a type of nitrogenous base found in DNA and RNA, characterized by a double-ring structure. The two purine bases found in DNA and RNA are:1. Adenine (A)2. Guanine (G)Both adenine and guanine have a double-ring structure, consisting of a nine-membered purine ring.
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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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