Enzymes

Step 1: Understanding ribozymes.
Ribozymes are RNA molecules that have catalytic properties, meaning they can catalyze biochemical reactions, just like protein enzymes.
They do not require proteins to function.
Step 2: Review of other enzymes.
Amylase: This is a protein enzyme that helps break down starches into sugars.
Isomerase: This is also a protein enzyme that catalyzes the conversion of a molecule into its isomer.
Lipase: This is a protein enzyme that catalyzes the breakdown of fats into fatty acids and glycerol.

Thus, the correct answer is (C) Ribozymes.