Exploring Factors Influencing Enzyme Activity

The video tutorial discusses factors affecting enzyme activity, including temperature, pH, substrate concentration, and enzyme concentration. It explains how each factor influences the rate of enzyme reactions, highlighting key concepts like kinetic energy, optimum conditions, and denaturation. The tutorial also covers how changes in these factors can lead to increased or decreased enzyme activity, providing examples and explanations relevant to exam questions.

Which of the following is NOT a factor affecting enzyme activity?

• pH

• Temperature

• Substrate concentration

• Light intensity

Why does enzyme activity increase with temperature up to a certain point?

• Enzymes become more stable

• Substrate concentration increases

• Kinetic energy of molecules increases

• Enzymes change shape

What is the term used to describe the temperature at which enzyme activity is highest?

• Critical temperature

• Peak temperature

• Optimal temperature

• Maximum temperature

What happens to enzymes at very high temperatures?

• They denature

• They become more active

• They become more stable

• They bind more substrates

How does pH affect enzyme activity?

• It changes the enzyme's shape

• It has no effect

• It increases substrate concentration

• It stabilizes the enzyme

Which enzyme works best in an acidic medium?

• Trypsin

• Pepsin

• Salivary amylase

• Lipase

What happens to enzyme activity when substrate concentration increases beyond a certain point?

• It decreases

• It continues to increase

• It remains constant

• It fluctuates

What is the limiting factor when all enzyme active sites are occupied?

• pH

• Substrate concentration

• Enzyme concentration

• Temperature

What happens to the rate of reaction as enzyme concentration increases?

• It increases

• It fluctuates

• It remains constant

• It decreases

When does substrate concentration become the limiting factor?

• When all active sites are occupied

• When pH is optimal

• When temperature is low

• When enzyme concentration is high