Chapter 21, Problem 25A

Interpretation Introduction

Interpretation:

The name should be given to the specific portion of the enzyme molecule where catalysis actually takes place.

Concept Introduction:

Enzymes are biocatalysts which performs many biochemical reactions in the cell.

Answer to Problem 25A

The specific portion of the enzyme molecule where catalysis actually occurs is known as active site.

Explanation of Solution

Enzyme is one kind of proteins. It has complex structure with particular amino acid sequence. There is also metal ion surrounded by specific ligands. The three dimensional structure of enzyme helps to attain a particular conformation required to bind with the substrate. The pocket where the substrate binds following “Lock- and Key” concept is the active site of the enzyme. The biocatalysis reaction is taking place here.

Conclusion

Active site of enzyme is explained where catalysis reactions actually take place.