A metal ion such as zinc or magnesium that an enzyme needs in order to work is called
Correct answer: A. a cofactor
- A. a cofactor
- B. a coenzyme
- C. a prosthetic protein
- D. a substrate
Explanation
Cofactor is the term for an inorganic helper, and zinc in carbonic anhydrase and magnesium in the kinases of respiration are standard examples. Coenzymes are organic helpers such as NAD and coenzyme A, usually derived from vitamins, so the distinction is simply inorganic against organic. This is why trace elements are needed in the diet in tiny but non negotiable amounts.
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About Characteristics of Enzymes
Enzymes are globular biological catalysts that lower activation energy without being consumed, usually showing specificity for particular substrates. Questions cover active sites, enzyme substrate complexes, the lock and key and induced fit models, intracellular and extracellular action, and the effects of denaturation, while distinguishing enzymes from non biological catalysts.
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