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Enzymes are biological protein catalysts that change the rate at which a process occurs in a biological system. The substrate is a molecule that binds to the enzyme's substrate-binding site.

The sigmoidal curve of enzyme X is displayed, whereas the hyperbolic curve of enzyme Y is shown.Cooperative binding is represented by the sigmoidal curve, whereas the hyperbolic curve represents non-cooperative binding.

The enzyme X is more effective when the substrate concentration is high and exhibits cooperative binding. On the other hand, when the substrate concentration is low, the enzyme Y is more effective and exhibits non-cooperative binding.

Hence, enzyme X is more efficient when the substrate concentration is high, whereas enzyme Y is more efficient when the substrate concentration is low.