Which of the following enzymes contain manganese as its cofactor?: (A) LDH, (B) Arginase, (C) Hexokinase, (D) DNA polymerase
Answer is B. Manganese: Cofactor for enzymes, e.g., arginase, pyruvate carboxylase.
Enzymes that require a metal ion cofactor are termed metal-activated enzymes to distinguish them from the metalloenzymes for which bound metal ions serve as prosthetic groups.
Reference-Satyanarayana Pg- 405