Enzyme Function and Activity Concepts

The video provides an interactive lecture on enzymes, explaining their role as catalysts in speeding up chemical reactions without being consumed. It covers enzyme structure, active sites, and substrate specificity, using the lock and key model. The concept of activation energy and how enzymes lower it to facilitate reactions is discussed. Factors affecting enzyme activity, such as temperature, pH, and substrate concentration, are explored. The video concludes with industrial applications of enzymes, including enzyme immobilization for producing lactose-free milk.

What is the primary role of enzymes in the body?

• To store energy

• To act as a catalyst in chemical reactions

• To transport oxygen

• To provide structural support

What is the term used to describe the specific fit between an enzyme and its substrate?

• Induced fit model

• Lock and key model

• Substrate inhibition model

• Random collision model

How do enzymes affect the activation energy of a reaction?

• They increase it

• They decrease it

• They have no effect

• They eliminate it

What happens to enzyme activity when the temperature is too high?

• It decreases due to denaturation

• It remains constant

• It increases indefinitely

• It doubles

Which factor does NOT affect enzyme activity?

• Temperature

• pH

• Color of the enzyme

• Substrate concentration

What is the effect of a pH shift from the optimal range on enzyme activity?

• It doubles the enzyme activity

• It enhances enzyme activity

• It has no effect

• It can denature the enzyme

What is the result of increasing substrate concentration beyond a certain point?

• Enzyme activity becomes unpredictable

• Enzyme activity stagnates

• Enzyme activity decreases

• Enzyme activity continues to increase

What is enzyme immobilization?

• Enzymes are fixed in place to facilitate reactions

• Enzymes are dissolved in a solution

• Enzymes are mixed with substrates

• Enzymes are heated to increase activity

How is lactose-free milk produced using enzymes?

• By adding sugar to the milk

• By heating the milk

• By removing water from the milk

• By using immobilized lactase enzymes

What are the products of lactose breakdown by lactase?

• Fructose and sucrose

• Galactose and sucrose

• Glucose and galactose

• Glucose and fructose