The number of hydrogen bonds between guanine and cytosine are:
Correct answer: C. Three
- A. One
- B. Two
- C. Three
- D. Four
Explanation
The Adenine - Thymine base pair is held together by 2 hydrogen bonds while the Guanine - Cytosine base pair is held together by 3 hydrogen bonds. Cytosine and guanine pairing can be found in both DNA and DNA-RNA hybrids formed during replication and transcription.
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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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