Can be calculated from various bits of information.
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The length of a helix can be calculated using the formula L = √(p^2 + h^2) * n * 2π, where p is the pitch of the helix, h is the height of one complete revolution, and n is the number of revolutions.
The length of an alpha helix can be calculated by multiplying the number of amino acids by the rise per residue (1.5 angstroms). For a beta strand, the length is dependent on the hydrogen bonding pattern, with an average distance of 3.5 angstroms between each residue in a beta-strand.
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Double Helix :D
Double Helix
The whole DNA strand is a double helix.