THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Adenine
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Cytosine
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Guanine
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Thymine
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Uracil
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Detailed explanation-1: -Adenine always forms two hydrogen bonds with Thymine (in case of DNA) and Uracil (in case of RNA) while Cytosine always forms three hydrogen bonds with Guanine.
Detailed explanation-2: -Adenine forms two hydrogen bonds with thymine, while cytosine forms three hydrogen bonds with guanine. These hydrogen-bonded nitrogenous bases are often referred to as base pairs.
Detailed explanation-3: -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. That is also the reason why the two strands of a DNA molecule can be separated more easily at sections that are densely populated by A-T base pairs.
Detailed explanation-4: -Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .
Detailed explanation-5: -Hydrogen bond (H-bond) binds the nitrogen bases between the two strands of DNA. There are two H-bonds between A and T; three H-bonds between G and C.