What is the coordination number of the Iron (Fe) ion in myoglobin under physiological oxygenated conditions?

Which of the following metalloenzymes does not contain zinc at its active site?

Which of the following element acts as an essential cofactor in nitrogenase enzyme?

Match the enzymes in Column I with the metal in their active sites (Column II) and the reaction class they catalyze (Column III): Column I: a. Catalase, b. Urease, c. Cytochrome c oxidase, d. Laccase Column II: p. Copper, q. Copper and iron, r. Iron, s. Nickel Column III: i. Hydrolysis reaction, ii. Decomposition reaction, iii. Phenol to quinone, iv. Oxygen to water The correct option is: