Enzyme Activity and Function Assessment

Enzymes are proteins with specific shapes crucial for their function. They interact with substrates like a lock and key, and their activity is influenced by pH, temperature, and concentration. Enzymes can become denatured if conditions are not optimal, losing their shape and function. Most enzymes work best at neutral pH and body temperature, but some prefer acidic or basic environments. Enzyme activity increases with concentration until all substrates are catalyzed.

What is the primary role of an enzyme's specific shape?

• To transport molecules

• To fit with its substrate and catalyze reactions

• To store energy

• To provide structural support

Which model describes the interaction between an enzyme and its substrate?

• Induced fit model

• Lock and key model

• Fluid mosaic model

• Signal transduction model

What happens to an enzyme when it becomes denatured?

• It becomes more active

• Its shape is lost and it cannot function

• It changes its substrate

• It becomes a different protein

Which of the following factors does NOT affect enzyme activity?

• Concentration

• Temperature

• Light intensity

• pH

At what pH do most enzymes have optimal activity?

• pH 7

• pH 9

• pH 5

• pH 2

How does enzyme activity change as pH moves away from the optimal level?

• It fluctuates randomly

• It decreases

• It remains constant

• It increases

At what temperature do most enzymes have peak activity?

• 20 degrees Celsius

• 30 degrees Celsius

• 40 degrees Celsius

• 50 degrees Celsius

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

• It increases

• It decreases

• It becomes erratic

• It remains unchanged

How does increasing enzyme concentration affect enzyme activity?

• It decreases activity

• It has no effect

• It changes the enzyme's shape

• It increases activity until substrate is limited

What limits the rate of enzyme activity when enzyme concentration is high?

• Substrate availability

• pH

• Temperature

• Enzyme shape