BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Fibrous proteins contain polypeptide chains organized approximately in parallel along a single axis, producing long fibers or large sheets. Such proteins tend to be mechanically strong and resistant to solubilization in water. Fibrous proteins often play a structural role in nature.

Detailed explanation-2: -The -keratins are fibrous proteins involved in the structure of hair, finger nails and horns, and their secondary structure is the -helix with a higher level of structure being the coiled coil. Fibroins (a -keratin) are fibrous proteins making up silk and spider webs, and their secodary structure is -sheets.

Detailed explanation-3: -Secondary structure The most common types of secondary structures are the helix and the pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of another.

Detailed explanation-4: -The secondary structure arises from the hydrogen bonds formed between atoms of the polypeptide backbone. The hydrogen bonds form between the partially negative oxygen atom and the partially positive nitrogen atom.

Detailed explanation-5: -Secondary structure refers to regular, recurring arrangements in space of adjacent amino acid residues in a polypeptide chain. It is maintained by hydrogen bonds between amide hydrogens and carbonyl oxygens of the peptide backbone.