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Please help me with this question. Have no idea how to answer on this question Pnnt Calculator red Periodic Table Question 10 of 10 Map o sapling a-Keratin is an intermediate filament with a basic structural unit of two a helices in a coiled coil. Each helix has a seven residue repeating unit (heptad repeat). A representation looking, down the helices of a coiled coil dimer is shown below. Each letter represents a different amino acid residue. Identify the three true statements about the structure of keratin. Click here to view a table of the amino acids Whn rnsdounvs sonsb and c are less likely to be polar or charged because they are in contact with the solvent Ile-Glu-His-Leu-Ser-Lys-Glu is a likely repeat in the helix of keratin. Each polypeptide in the dimer has 3.6 residues per turn, and a nonpolar group occurs every 3.5 residues, resulting in a slight winding, or twist around the other polypeptide forming a co led coil The helix of the coiled coil is wound less tightly than predicted for an helix. Lys-Leu-Glu-Ser-Glu-Glu-Lys is a likely repeat in the helix of keratin. Keratin molecules are very strong due to hydrophilic interactions between charged amino acid side chains chairs and rich as Cys residues enabling the formation of covalent cross-links between peptide chains and increasing the strength of the protein. O Previous e Check Answer O Next Exit Hint

Explanation / Answer

The three two statements about alpha keratin are as follows:

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