AP BIOLOGY

Detailed explanation-1: -Hence, the correct answer is ‘Secondary structure’.

Detailed explanation-2: -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-3: -What is a beta-pleated sheet of protein? Beta-Pleated Sheets of Protein is a type of secondary structure of a protein. It consists of various beta strands linked by hydrogen bonds between adjacent strands. Three to ten amino acids are combined to create a beta-strand polypeptide.

Detailed explanation-4: -In -helix structure of proteins, the polypeptide chains are stabilized by intramolecular hydrogen bonding whereas -pealed sheet structure of proteins is stabilized by intermolecular hydrogen bonding.

Detailed explanation-5: -The Alpha Helix. An alpha helix is an element of secondary structure in which the amino acid chain is arranged in a spiral. The kinemage linked above shows an individual alpha helix, viewed from the N-terminal end to resemble the “helical wheel” (see figure below).