DNA strands are anti-parallel because of

H bonds

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Phosphate diester bonds

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Disulphide bonds

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Phosphate bonds

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Solution

The correct option is B Phosphate diester bonds
The DNA strands are anti-parallel because the two strands of the DNA are similar in structure but they are oppositely aligned. The phosphodiester bond is formed between 3'-5' carbon of two sugar molecules in the right side while it is between 5' -3'carbon molecules on the left hand side . This peculiar alignment provides an anti-parallel structure.

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