One of the following enzymes is not a protein
**Core Concept**
Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are typically proteins, but some are nucleic acids or other types of molecules that facilitate biochemical transformations.
**Why the Correct Answer is Right**
The correct answer is likely to be a non-protein enzyme, such as an RNA-based enzyme known as a ribozyme. Ribozymes are RNA molecules that can catalyze specific chemical reactions, often involving the cleavage or ligation of phosphodiester bonds within the RNA molecule itself.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely to be a protein-based enzyme, such as lactase, which catalyzes the breakdown of lactose into glucose and galactose in the small intestine. Lactase is a protein enzyme that requires an active site to facilitate the reaction.
**Option B:** This option may be a protein-based enzyme, such as DNA polymerase, which is responsible for replicating DNA during cell division. DNA polymerase is a protein enzyme that requires a template strand to synthesize new DNA.
**Option C:** This option is likely to be a protein-based enzyme, such as lysozyme, which breaks down bacterial cell walls by cleaving peptidoglycan bonds. Lysozyme is a protein enzyme that requires an active site to facilitate the reaction.
**Clinical Pearl / High-Yield Fact**
Ribozymes have been explored as potential therapeutic agents for treating various diseases, including viral infections and cancer. They can be designed to target specific RNA sequences, making them useful for developing RNA-based therapies.
**Correct Answer:** D