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NCERT · Class 11 · Biology

Chapter 9: Biomolecules

Practice each question, then open the answer or worked solution.

Textbook exercises

11 questions
Q11Written answer

Describe the important properties of enzymes.

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Ans: Enzymes are proteins that catalyse biochemical reactions in cells. So, usually, enzymes are proteins but sometimes RNA also behaves catalytically. Catalytic RNAs are called Ribozymes. Each enzyme works best at its optimum temperature. Subsequently, enzymes are proteins, they are denatured at high temperatures.



Enzymes Work Most Excellent At Their Optimal pH




Graph That Displays The Effect of pH On Enzyme Activity



i. With the rise in substrate concentration, the velocity of the enzymatic reaction increases at first. The reaction ultimately achieves a maximum velocity (v max) which is not exceeded by any additional increase in the concentration of the substrate. 

ii. The activity of an enzyme is also sensitive to the presence of particular chemicals (maybe modulators or inhibitors of enzyme action) that bind to the enzyme. 

iii. Enzymes are substrate-specific. Due to the three-dimensional folding of the enzyme, it forms pockets or crevices. One such pocket is called the active site. An active site of the enzyme is a crevice or a pocket at which the substrate binds.