What distinguishes parallel from antiparallel beta-sheets?
Explanation
The key difference between parallel and antiparallel beta-sheets lies in the orientation of the polypeptide strands and the resulting geometry of the interstrand hydrogen bonds. In antiparallel sheets, the strands run in opposite directions, allowing for linear, stronger hydrogen bonds. In parallel sheets, the strands run in the same direction, resulting in angled, weaker hydrogen bonds.
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