GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The force of the twist
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covalent bonds
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ionic bonds or ionic interactions
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hydrogen bonds
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Detailed explanation-1: -hydrogen. Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components). Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.
Detailed explanation-2: -Each DNA molecule consists of two nucleotide chains wrapped around each other in a double helix and held together by hydrogen bonds. This hydrogen bonding involves only the nitrogenous bases. Each of the purine bases can hydrogen bond with one and only one of the pyrimidine bases.
Detailed explanation-3: -Hydrogen bonding stabilizes DNA double helices across the helix axis but not in the direction of the axis 1. In DNA, the deoxyribose-phosphate backbone can act as hydrogen-bond acceptor only through phosphate and sugar oxygen atoms.