Question

Which explanation best explains the role of enzymes as catalysts in living systems?

Answer 1

Enzymes are catalysts that can be used more than once. If a substance needs to get broken down then it can use the corresponding enzyme to attach itself and break it down into simpler substances. After this is gone, the next substance might come up and attach itself to the enzyme like a lock-and-key model.

Therefore the answer is A) Enzymes accelerate chemical reactions without getting used up in the process.