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...
In Pokemon Diamond/Pearl/Platinum, you dig it up underground. In HeartGold/SoulSilver, you smash rocks in the Ruins of Alp. You can also find it in FireRed/LeafGreen, in Mt. Moon, near the end of the...