Waec Biology 2007 Past Questions and Answers

Question 31:

• WAEC 2007

'The colour that is associated with a positive iodine test is

A. Brown
B. Red
C. Blue-black
D. Yellow

Question 32:

• WAEC 2007

Enzymes can be inactivated by certain chemical substances in the body called

A. Catalysts
B. Inhibitors
C. Substrates
D. Activators

Question 33:

• WAEC 2007

Use the following equations to answer the question below
I - Boiled saliva + starch → X
II - Fresh saliva + starch → Y What substances do X and Y represent?

A. X = Maltose and Y = Sugar
B. X = Starch and Y = Maltose
C. X = Sugar and Y = Starch
D. X = Maltose and Y = Starch

Question 34:

• WAEC 2007

Which of the following enzymes is not one of the main classes of enzymes?

A. Sucrase
B. Amylases
C. Proteases
D. Lipases

Question 35:

• WAEC 2007

Which of the following enzymes does not belong to proteases?

A. Sucrase
B. Pepsin
C. Trypsin
D. Erepsin