Help with the folowing questions?

The a-helix of the secondary structure of a protien is held together by--between two widely separated parts of a protien chain.
a) hydrophobic interactions
b) disulfide bridges
c)hydrophilic interactions
d)hydrogen bonds
e) salts bridges

A glycosidic bond between 2 monosaccharides can also be classified as a(n)

a) double bond
b) ether bond
c) ester bond
d) alcohol bond
e) achiral bond

Answer:
agreed,
d)hydrogen bonds
and
b)ether bond
Definitely d and then b.

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