IG 5.2 Quiz: Factors that affect Enzymes

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  
• The optimum pH of the enzyme is 5.8
  
• The enzyme’s activity increases as pH increases 5.0 to 9.0
  
• The enzyme’s activity is greater around pH of 8.0 .
  

What affects Enzyme activity?

• cold temperature & pH levels
• hot or cold temperature & environment
• high temperature &  pH levels
• pH levels & environment

At high temperatures enzyme activity declines because:

• enzymes denature changing the shape of the active site

• enzymes disappear

• Increased H-Bonding

• fit with the substrate causing a reaction

Based on the graph, what is the optimal temperature for this enzyme? 

• 15^oC
• 40^oC
• 30^oC
• 35^oC

Which of these is NOT true?

• Enzymes can denature (change shape) when the temperature gets too high.
• Enzymes can only be used once in a chemical reaction. 
• Extreme pH can denature enzymes.
• Enzymes speed up chemical reactions. 

Tags

NGSS.HS-PS1-2

The pH at which an enzyme is most efficient is called the _________ pH of an enzyme.

• neutral
• optimum
• minimum
• experimental 

If enzyme C is functioning at 25°C and a pH of 7, under which conditions would the rate of enzyme action probably increase?Use the chart below and your knowledge of enzymes to answer the question.

• The temperature is decreased to 22 C and the pH is kept the same
• The temperature is kept the same and the pH is decreased to 6
• The temperature is increased to 44 C and the pH is kept the same
• The temperature is increased to 30 C and the pH is increased to 8

Which statement best describes the enzyme represented in the graphs below? 

• This enzyme works best at a temperature of 35 C and a pH of 8
• This enzyme works best at a temperature of 50 C and a pH of 12
• Temperature and pH have no influence on the activity of this enzyme
• This enzyme works best at a temperature above 50 C and a pH above 12

Why does enzyme activity decrease when it is in solution that has either a too high or too low pH?

• All enzymes only work in neutral solutions
• Enzyme activity remains unchanged in different pH's
• The shape of the active site changes
• The shape of the substrate changes

After the enzyme and substrate bind together and perform the reaction, what does the substrate become?

• a substrate
• an enzyme
• a product
• an active site