Enzyme Function and Activity Concepts

This video covers the structure and function of enzymes, highlighting their role in controlling chemical reactions essential for metabolism and homeostasis. It explains enzyme substrate specificity, the induced fit model, and how enzymes lower activation energy to catalyze reactions. The video also discusses how factors like temperature, pH, and substrate concentration affect enzyme activity, using graphs to illustrate these concepts.

What is the primary role of enzymes in the body?

• To store energy

• To control chemical reactions

• To transport oxygen

• To provide structural support

Which model suggests that enzymes and substrates change shape slightly to fit together?

• Induced Fit Model

• Lock and Key Model

• Double Helix Model

• Fluid Mosaic Model

How do enzymes lower the activation energy of a reaction?

• By adding more substrates

• By increasing the temperature

• By providing a favorable environment

• By changing the pH

In an activation energy graph, what does the peak represent?

• The start of the reaction

• The end of the reaction

• The activation energy

• The energy of the products

Why do enzymes not change the energy of reactants and products?

• They are not involved in the reaction

• They only affect the speed of the reaction

• They change the energy of the products only

• They are consumed in the reaction

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

• It increases indefinitely

• It remains constant

• It becomes more efficient

• It decreases rapidly

What is the effect of pH on enzyme activity?

• It can denature enzymes if too high or low

• It always increases enzyme activity

• It only affects enzymes in the stomach

• It has no effect

What is the shape of the graph that represents enzyme activity versus substrate concentration?

• S-shaped

• Linear

• Bell-shaped

• Parabolic

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

• pH

• Temperature

• Substrate concentration

• Light intensity

What is the term for the temperature at which enzyme activity is highest?

• Maximum temperature

• Optimal temperature

• Threshold temperature

• Critical temperature