Higher Human Biology Practice Questions - Higher Human Biology (Qualifications Scotland SCQF Level 6) Exam

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What structural feature of the DNA double helix explains why the two sugar-phosphate backbones run in opposite directions?

The antiparallel orientation of the strands, where one strand runs 5' to 3' and the complementary strand runs 3' to 5' The presence of uracil bases bound to ribose sugars in place of thymine The covalent peptide bonds connecting complementary nitrogenous bases across the helix axis The triple helix coil stabilized by ionic bonds between adjacent phosphate groups

Correct Answer:

The antiparallel orientation of the strands, where one strand runs 5' to 3' and the complementary strand runs 3' to 5'

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