This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
True about isozymes is: 
Select and explain. 
A. They catalyse the same reaction, B. Same quaternary structure, C. Same distribution in different organs, D. Same enzyme classification with same number and name
A: They catalyse the same reaction
Answer: A: They catalyse the same reaction 
Explanation: The multiple forms of an enzyme catalysing the same reaction are isoenzymes or isozymes. They however differ in their physical and chemical properties which include the structure, electrophoretic and immunological properties, Km & Vmax values, pH optimum, relative susceptibility to inhibitors and degree of denaturation.
Reference-Haper 30th edition pg -66 & satyanarayana pg 105