Enzyme Activity and Influencing Factors

Which of the following factors can affect enzyme activity?

• Temperature

• pH

• Substrate concentration

• All of the above

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

• It becomes more active

• It denatures

• It becomes inactive but not denatured

• It remains unchanged

Tags

NGSS.HS-LS1-7

How does pH affect enzyme activity?

• Enzymes are not affected by pH

• Enzymes work best at a specific pH

• Enzymes work better at high pH

• Enzymes work better at low pH

Explain why enzymes have an optimal temperature range.

• Enzymes are proteins that can denature at high temperatures

• Enzymes are lipids that dissolve at high temperatures

• Enzymes are carbohydrates that crystallize at low temperatures

• Enzymes are nucleic acids that mutate at high temperatures

Describe the effect of pH on enzyme activity using the concept of enzyme structure.

• pH changes can alter the enzyme's active site

• pH changes can increase enzyme concentration

• pH changes can increase substrate concentration

• pH changes have no effect on enzyme structure

A student observes that an enzyme-catalyzed reaction rate increases with temperature up to a point, then decreases. Explain this observation.

• Enzymes become more active with heat, but too much heat denatures them

• Enzymes are not affected by temperature

• Enzymes dissolve at high temperatures

• Enzymes are consumed in the reaction

Given an enzyme with an optimal pH of 7, predict the effect of a pH of 4 on its activity and explain why.

• Activity will increase due to increased acidity

• Activity will decrease due to denaturation

• Activity will remain the same

• Activity will increase due to increased substrate concentration

A reaction is catalyzed by an enzyme with a known optimal temperature. If the reaction is performed at a temperature significantly lower than the optimal, what is the expected outcome and why?

• The reaction rate will increase due to lower energy requirements

• The reaction rate will decrease due to reduced molecular movement

• The reaction rate will remain unchanged

• The reaction will not occur

Tags

NGSS.HS-PS1-5