Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: This super fast train can obviously reach great speeds. And there's a lot of technology that helps this train go fast. Speaking of helping things go fast brings us to enzymes. Life could not exist without enzymes. Essentially, enzymes are biological catalysts that speed up biochemical reactions. Answer: enzymes
What are biological catalysts that speeds up biochemical reactions?