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type of bond holds together the two strands of a DNA molecule?

an der Waals

ydrogen

The type of bond that holds together the two strands of a DNA molecule is hydrogen bonding. Hydrogen is not the only atom involved in the formation of these bonds, but it is the main component. The other options, an der Waals, ydrogen, onic, and ovalent bonding, are incorrect because they involve different types of interactions and do not specifically refer to the type of bond holding DNA strands together. An der Waals forces are weak intermolecular forces between neutral molecules, ionic bonds are formed between a positively charged ion and a negatively charged ion, and covalent bonds involve a sharing of electrons between atoms. These types of bonding do not play a role in the structure of a DNA molecule. Hydrogen bonding specifically refers to the interaction between a hydrogen atom and a highly electronegative atom, such as oxygen or nitrogen. Therefore, hydrogen bonding is the correct

onic

ovalent

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