Multiple Choice
In the DNA double helix, what type of bonds hold complementary nitrogenous bases together across the two strands?
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7. DNA and Chromosome Structure
DNA Structure
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In the DNA double helix, what type of chemical bond holds the sugar-phosphate backbone together within a single strand?
A
Hydrogen bonds between complementary nitrogenous bases
B
Van der Waals interactions between stacked bases
C
Ionic bonds between negatively charged phosphate groups and positively charged bases
D
Phosphodiester covalent bonds between the hydroxyl of one sugar and the phosphate of the next nucleotide
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