Enzyme Activity and Lactase Function

The video tutorial explores the effects of temperature and pH on the enzymatic activity of lactase. It describes lab exercises where students test lactase activity by measuring glucose production under various temperatures and pH levels. The optimal temperature for lactase is around 40°C, while the optimal pH is 7, aligning with human body conditions. Graphical representations illustrate how deviations from these optimal conditions affect enzyme activity, highlighting the concepts of denaturation and molecular movement.

What are the two environmental conditions being tested in the enzyme lab?

• Light and humidity

• Temperature and pH

• Wind and altitude

• Pressure and salinity

In the temperature experiment, what is the main indicator of enzymatic activity?

• Temperature change in the solution

• Amount of oxygen produced

• Change in color of the solution

• Amount of glucose produced

Which temperature was hypothesized to be optimal for lactase activity?

• 25°C

• 100°C

• 0°C

• 40°C

What happens to enzyme activity at 0°C?

• Enzyme activity is optimal

• Enzyme denatures

• Molecules move too slowly

• Enzyme activity increases

What is the scientific term for the unfolding of an enzyme at high temperatures?

• Sublimation

• Hydrolysis

• Condensation

• Denaturation

What pH level was initially hypothesized to be optimal for lactase activity?

• 12

• 7

• 5

• 2

Where in the human body is lactase primarily utilized?

• Stomach

• Small intestine

• Pancreas

• Liver

What was found to be the optimal pH for lactase activity?

• 12

• 7

• 5

• 2

What is the main reason for decreased enzymatic activity at extreme pH levels?

• Denaturation of the enzyme

• Lack of substrate

• Optimal enzyme activity

• Increased substrate concentration

To achieve the highest enzymatic activity, what conditions should be optimized?

• Neither temperature nor pH

• Both temperature and pH

• Only pH

• Only temperature