Chapter 4 Enzymes - Worksheet
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Jurongville Secondary School Secondary 3 Express Tutorial Worksheet Syllabus 5100 Name: _________________________ (
)
Class: Sec 3___ Chapter 5: 1.
Date: ____________
Enzymes
Preliminary Concepts a. What are the catalysts found in living cells? _________________________________________________________________ b. What is the optimum temperature at which enzymes work? _________________________________________________________________ c. State 2 characteristics of enzymes that are related to their protein nature. _________________________________________________________________ _________________________________________________________________ d. Why are enzymes specific in their actions? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________
2.
Application of Concepts a. The graph below shows the rate of enzyme-catalysed reactions.
In Graph A, which line correctly continues the graph after 30°C?
1
_________________________________________________________________ b. i. According to the answer in (a), at which temperature is enzyme activity the greatest? ____________________________________________________________ ii. Beyond this temperature, explain what happens to the activity of the enzyme. ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ c. Study graph B and state the optimum pH values for the activities of enzymes X, Y and Z. _________________________________________________________________ d. Complete the table below. Digestive juices produced in
pH in
Enzyme present (from
medium Neutral Acidic Alkaline
graph B)
Mouth Stomach Small Intestine e.
i. What will happen to the activity of each enzyme as pH moves away from the optimum value? ___________________________________________________________ ii. Which property of enzymes is responsible for this behavior? ___________________________________________________________
~~END OF TUTORIAL~~
2
)
Class: Sec 3___ Chapter 5: 1.
Date: ____________
Enzymes
Preliminary Concepts a. What are the catalysts found in living cells? _________________________________________________________________ b. What is the optimum temperature at which enzymes work? _________________________________________________________________ c. State 2 characteristics of enzymes that are related to their protein nature. _________________________________________________________________ _________________________________________________________________ d. Why are enzymes specific in their actions? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________
2.
Application of Concepts a. The graph below shows the rate of enzyme-catalysed reactions.
In Graph A, which line correctly continues the graph after 30°C?
1
_________________________________________________________________ b. i. According to the answer in (a), at which temperature is enzyme activity the greatest? ____________________________________________________________ ii. Beyond this temperature, explain what happens to the activity of the enzyme. ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ c. Study graph B and state the optimum pH values for the activities of enzymes X, Y and Z. _________________________________________________________________ d. Complete the table below. Digestive juices produced in
pH in
Enzyme present (from
medium Neutral Acidic Alkaline
graph B)
Mouth Stomach Small Intestine e.
i. What will happen to the activity of each enzyme as pH moves away from the optimum value? ___________________________________________________________ ii. Which property of enzymes is responsible for this behavior? ___________________________________________________________
~~END OF TUTORIAL~~
2
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