Sort the following phrases as descriptions of keratin, collagen or fibroin. Note

Question

Sort the following phrases as descriptions of keratin, collagen or fibroin. Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the phrases are sorted incorrectly. -Keratin Collagen Fibroin constituent of silk constituent of hair each chain is an alpha helix each chain is a beta strand constituent of tendons 2 helices coiled about each other 3 helices coiled about each other You have misplaced one of the phrases describing keratin. Keep in mind that mammals have keratin-containing structures. Which structure is a characteristic of mammals?

Explanation / Answer

Alpha keratin - constituent of hair, left handed helices, 2 strands coiled around each other, intrachain hydrogen bonds, heptad repeats

Fibrion - constituent of silk, each chain a beta strand, every second residue is glycine,

Collagen - constituent of tendons, every third residue is glycine, contains hydoxyproline, 3 helices coiled about each other, interchain Hydrogen bonding,

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