Letter Y most likely represents
A.
B.
C.
D.
A neurotransmitter
A hormone
A lipid
An enzyme
Letter Z most likely represents molecules of
A.
B.
C.
D.
Water
Plant hormones
Glycogen
Nucleic acids
The effect of temperature on the relative rate of action of an enzyme is represented in the
graph below.
The optimum temperature for the action of this enzyme is approximately
A. 15oC
B. 22oC
C. 37oC
D. 50oC
Which statement most accurately represents information shown in the graph?
A. Enzyme rates are not affected by cold temperatures.
B. At OoC, the enzyme is inactive.
C. The enzyme is more active at 25oC than at 50oC.
D. The enzyme is less active at 55oC than at 59oC.
Which factor can most likely accounts for the change in the rate of enzyme action as the
temperature increases from 40oC to 59oC?
A. Excess acids have been building up, causing the enzymes to become fatigued.
B. Too much substrate is present at these high temperatures.
C. Not enough substrate is present at these high temperatures.
D. The high temperature causes the shape of the enzyme to be altered.
Use the diagram below to answer the next two questions.
In molecule B, what type of group is contained in box Y?
A. an amino group
C. a variable goup
B. a carboxyl group
D. a peptide group
How many peptide bonds are present in molecule A?
A. 1
B. 2
C. 3
D. 4
Which compound contains both an amino group and a carboxyl group?
A.) A
B.) B
C.) C
D.) D
Which compounds represent carbohydrates?
A.) A and E
B.) B and F
C.) A and F
D.) B and D
Which compound represents the monomer of both a DNA molecule and an RNA molecule?
A.) A
B.) B
C.) E
D.) F
Which of these factors was NOT controlled in the experiment?
A. the time for oxygen release
B. the volume of hydrogen peroxide solution
C. the volume of the test tube
D. the mass of the liver and potato samples
The student conducted a second experiment. She boiled the liver tissue completely and added it to
the hydrogen peroxide solution. She observed the little to no oxygen was released in the second
experiment.
Which of these statements BEST supports the student’s observations?
A. Exposing catalase to high temperatures makes it inactive.
B. Exposing catalase to high temperature changes it into a different enzyme.
C. Boiling liver breaks down hydrogen peroxide faster.
D. Boiling removes oxygen from the live