Unlocking the Secrets of Enzymes in Biological Reactions

Enzymes are crucial proteins that act as biological catalysts, speeding up reactions by lowering activation energy. They work with substrates in a lock and key mechanism, are reusable, and have specific conditions for optimal activity. Enzymes are used in various reactions and industries, such as in washing powders and juice production.

What is the primary role of enzymes in biological reactions?

• To speed up reactions by lowering activation energy

• To slow down the reaction rate

• To change the products of the reaction

• To increase the activation energy

How do enzymes and substrates interact according to the lock and key model?

• The substrate changes shape to fit the enzyme

• The enzyme and substrate fit together without changing shape

• The enzyme changes shape to fit the substrate

• The enzyme and substrate repel each other

Which enzyme breaks down proteins into amino acids?

• Catalase

• Lipase

• Carbohydrase

• Protease

What is the role of catalase in cells?

• To convert fatty acids into glycerol

• To break down hydrogen peroxide into water and oxygen

• To synthesize proteins

• To break down glucose

What happens to enzyme activity when the temperature exceeds the optimum level?

• The enzyme becomes more efficient

• The activity increases indefinitely

• The enzyme denatures and activity decreases

• The enzyme changes its substrate

Why is it important to have a sufficient concentration of substrate for enzyme activity?

• To ensure the enzyme is not reused

• To prevent enzyme denaturation

• To maintain a high rate of reaction

• To change the enzyme's active site

Which condition is NOT a factor affecting enzyme activity?

• Substrate concentration

• pH level

• Light intensity

• Temperature

How do enzymes in biological washing powders help in cleaning?

• By adding fragrance to clothes

• By breaking down proteins and fats in stains

• By changing the color of stains

• By increasing the water temperature

What is the function of pectinase in the food industry?

• To change the color of fruit juice

• To break down fruit cells for more juice extraction

• To enhance fruit flavor

• To preserve fruit

Which of the following is NOT a use of enzymes in daily life?

• In the food and drink industry

• In the production of synthetic fibers

• In biological washing powders

• In the digestion of food