Which option about 3-10 helix isn't correct?
a) Like the alpha helix, the 3-10 helix is right-handed.
b) The 3-10 helix has a tighter hydrogen-bonded ring structure than the a helix
c) The carbonyl oxygen of a 3-10 helix forms a hydrogen bond with the amide hydrogen of residue n 3
d) The 3-10 helix is slightly more stable than the alpha helix
