AP BIOLOGY

Detailed explanation-1: -Catalase is a globular protein, it’s quaternary structure contains 4 haem prosthetic groups. The presence of iron II prosthetic groups allows the enzyme to speed up the break down hydrogen peroxide.

Detailed explanation-2: -Examples of globular proteins include haemoglobin, insulin and many enzymes in the body. The increased solubility of the proteins is all down to the folding of the protein.

Detailed explanation-3: -Insulin is a small globular protein containing two chains, A (21 residues) and B (30 residues) (Fig. 2.1A).

Detailed explanation-4: -Hemoglobin is an example of a globular protein. It consists of four polypeptide chains, each folded onto itself. Each chain is attached to a heme group–a ring-like structure with an iron atom at the center. It is at these iron atoms that oxygen molecules bind to hemoglobin.