Question

based on their substrates, ends in \-ase\ (example: lipid-lipase, protein-protease, lactose-lactase) specific catalyst names of enzymes lock and key model

Explanation:

To determine which box the description "Based on their substrates, ends in '-ase' (example: lipid - lipase, protein - protease, lactose - lactase)" belongs to, we analyze each option:

Option 1: Specific

The term "specific" in the context of enzymes usually refers to enzyme specificity (like substrate specificity). But the given description is about how enzymes are named based on their substrates, not about the specificity of enzymes in terms of their action on substrates (e.g., how specific an enzyme is to a particular substrate's structure). So this is not the correct box.

Option 2: Catalyst

A catalyst is a substance that speeds up a chemical reaction without being consumed. The description is about enzyme naming, not about the catalytic nature of enzymes. So this is not the correct box.

Option 3: Names of Enzymes

The description gives examples of how enzymes are named (based on their substrates and ending with "-ase"). Lipase is named after lipid (its substrate), protease after protein, and lactase after lactose. This directly relates to the naming convention of enzymes. So this is the correct box.

Option 4: Lock and Key Model

The lock - and - key model is a theory that explains how enzymes interact with their substrates (the enzyme is the lock and the substrate is the key). The given description is not about the mechanism of enzyme - substrate interaction but about enzyme naming. So this is not the correct box.

Answer:

C. Names of Enzymes