Catechol dioxygenase is an iron-containing enzyme.

Carboxypeptidase and Carbonic anhydrase are zinc-containing enzymes.

Neutral protease and α-Amylase contain zinc (Zn²⁺) and calcium (Ca²⁺) ions.

Catalase belongs to Category EC 1.11 of oxidoreductases (EC 1), which act on peroxide as an acceptor. Catalase catalyses the decomposition of hydrogen peroxide to water and oxygen.

Synthesis of enzymes is regulated by operator and regulator genes.

Pyruvate dehydrogenase belongs to Category EC 1.2 of oxidoreductases (EC 1), which act on the aldehyde or oxo group of donors. Pyruvate dehydrogenase performs the first two reactions within the pyruvate dehydrogenase complex: decarboxylation of pyruvate and reductive acetylation of lipoic acid.

Selenium is an important constituent of the enzyme glutathione peroxidase, which is responsible for destroying lipid-damaging peroxides.

This option is correct because haemoglobin is an iron-containing oxygen-transport metalloprotein which transports O2 from the lungs to the tissues. Myoglobin, an iron-containing protein in muscles, receives oxygen from the red blood cells and transports it to the mitochondria of muscle cells and many enzymes vital to life contain iron, such as catalase, lipoxygenases and IRE-BP.

This option is correct because Galactose oxidase is a monomeric enzyme that contains a single copper ion and catalyses the stereospecific oxidation of primary alcohols to their corresponding aldehydes.

Alkaline phosphatase contains both zinc (Zn²⁺) and magnesium (Mg²⁺) ions.

Zymography is an electrophoretic technique for the detection of hydrolytic enzymes, based on the substrate repertoire of the enzyme.

This option is correct because urease is a nickel-containing metalloenzyme of high molecular weight that catalyses the hydrolysis of urea into carbon dioxide and ammonia, and dopamine β-hydroxylase is a copper-containing enzyme that synthesises norepinephrine from dopamine.

Formaldehyde ferredoxin oxidoreductase is a tungsten-containing metalloenzyme.

Metalloenzymes are proteins which function as an enzyme and contain metals. For example, Arginase contains Mn²⁺, Phosphotransferase Mg²⁺, Cytochrome oxidase Cu²⁺, and Alcohol dehydrogenase Zn²⁺.

Zinc-finger nucleases are artificial restriction enzymes obtained by fusing a zinc finger DNA-binding domain to a DNA-cleavage domain. The DNA-binding domains of individual ZFNs are typically contained between three and six individual zinc finger repeats and can each recognise between 9 and 18 base pairs.