Would you expect an enzyme that is active in an arctic fish to function just as well in a tropical fish?

Question

Thanks for your help guys :)

Answer 1

No, because enzymes need specific temperature to function at their highest potencial.

For example, an enzyme that reaches it's fullest potencial at 25°C, might work half as efficiently in a 10°C environment.

Answer 2

No; animals living in different environments will have different forms of the "same" enzyme. It accomplishes the same function, but has a different temperature optimum. They are called "isoforms" and are a part of why animals can adapt to live in areas with temperatures different from what they are used to.