Enzyme Activity and Function Concepts

The video explores why we get fevers when sick and how it affects appetite by examining factors influencing enzyme activity. It covers enzyme and substrate concentration, temperature, and pH effects on enzyme reactions. Enzyme concentration increases reaction rates, while substrate concentration initially boosts rates until saturation. Temperature affects enzyme activity, with optimal activity near body temperature. High temperatures cause denaturation, rendering enzymes inactive. pH levels also impact enzyme activity, with extreme pH causing denaturation.

Why does increasing enzyme concentration increase the reaction rate?

• Because enzymes are consumed in reactions.

• Because enzymes change the substrate.

• Because more enzymes mean more reactions can be catalyzed.

• Because enzymes slow down reactions.

What happens to the reaction rate when all enzymes are saturated with substrate?

• The reaction rate decreases.

• The reaction rate becomes constant.

• The reaction stops completely.

• The reaction rate increases indefinitely.

How does temperature initially affect enzyme activity?

• It increases enzyme activity.

• It stops enzyme activity.

• It has no effect on enzyme activity.

• It decreases enzyme activity.

What is the optimum temperature for most human enzymes?

• Around 37°C

• Below 20°C

• Above 50°C

• Exactly 0°C

What is the main reason for loss of appetite during a fever?

• Denaturation of enzymes.

• Decreased enzyme activity.

• Saturation of enzymes.

• Increased enzyme activity.

What is the effect of extremely high temperatures on enzymes?

• Enzymes become more active.

• Enzymes denature and lose their function.

• Enzymes change their substrate.

• Enzymes are unaffected.

What does denaturation do to an enzyme?

• It enhances the enzyme's activity.

• It changes the enzyme's shape, making it nonfunctional.

• It increases the enzyme's binding capacity.

• It makes the enzyme more stable.

Which enzyme prefers a neutral pH environment?

• Pepsin

• Arginase

• Amylase

• Lipase

What happens to enzyme activity at extreme pH levels?

• Enzyme activity increases.

• Enzyme activity remains constant.

• Enzyme activity is unaffected.

• Enzyme activity decreases.

Why do enzymes have an optimum pH?

• Because they are more stable at this pH.

• Because they are consumed at this pH.

• Because they are inactive at this pH.

• Because they denature at this pH.