From the list given below what options applies to fibrous proteins

a) Monomers are held together by covalent glycosidic linkages
b) Structure allows them to act as informational molecules
c) Very high tensile strength
d) Higher order structure is determined by weak interactions between R groups
e) Constructed of only amino acid e.g. alanine repeated over & over
f) May function as transport proteins in cell membranes
g) May function as biological catalysts
h) Elongated very thin structures consisting of chains of monomers wound around each other
i) Constructed from amino acid monomers