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This is quite simple. Using stoichiometry to keep track of units, simply take the number of amino acids in the particular alpha helix and multiply by 15 angstroms. This is the length the alpha helix is advanced along the length axis by each additional A.A. For a beta helix it become more difficult however and you must know how many sheets you are taking into account.

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16y ago
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5mo ago

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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Q: How do you find out the length of alpha helix and beta helix?
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