Lecture 9 Basics: ATP, enzymes, redox
Energy Basics:
Cellular work:
Free energy:
Adenosine triphosphate
Lecture 9 page 1
Hydrolysis:
Enzymes:
Lecture 9 page 2
Activation energy and enzymes
Oxidation and Reduction:
Reduced molecules-
Oxidized molecules-
Lecture 9 page 3
Redox reactions:
Summary of cellular respiration
Summary of photosynthesis
Class Notes:
Lecture 9 page 4
Energy
1. Which of the following is an endergonic reaction?
A. Amino acids to polypeptide
B. Disaccharide to monosaccharides
C. ATP to ADP + Pi
D. Invent your own true answer
True/False
Explanation
A
B
C
D
2. Which of these measures of free energy would be the same in the presence OR absence of an
enzyme?
A
B
C
D
E
True/False
Explanation
A
B
C
D
E
ATP
3. The energy released by cleaving the terminal phosphate from ATP is:
A. able to drive an endergonic reaction
B. used to increase the rate of facilitated diffusion
C. necessary for conformation changes in myosin
D. is important in G-protein receptor signaling
True/False
Explanation
A
B
C
D
Lecture 9 page 5
4. Hydrolysis of ATP:
A. requires an enzyme
B. requires a water molecule
C. is an endergonic reaction
D. has no activation energy
E. is required for all cellular work
True/False
Explanation
A
B
C
D
E
Enzymes:
5. Which of the following statements about enzymes is TRUE?
A. Enzymes can be synthesized on free or bound ribosomes
B. Enzymes speed up reaction rate by increasing the energy available
C. Enzymes lower the activation energy of a reaction
D. Enzymes can use energy from ATP to become macromolecules
E. Enzymes can turn an endergonic reaction into an exergonic reaction
True/False
Explanation
A
B
C
D
E
6. Inhibiting the activity of an enzyme important in dehydration reactions and ester bonds could
result in a(n):
A. Decrease in concentration of nucleic acids
B. Increase in concentration of steroids
C. Decrease in the average length of fats
D. Decrease in the number of phospholipids
True/False
Explanation
A
B
C
D
Lecture 9 page 6
Redox Reactions
7. The general reaction for cellular respiration is
C6H12O6 + 6O2  6CO2 + 6H2O
Which molecule in this reaction has the high energy electrons?
A. CO2
B. H2O
C. C6H12O6
D. O2
True/False
Explanation
A
B
C
D
8. In photosynthesis:
6 CO2 + 12 H2O + light energy >> C6H12O6 + 6 O2
a. What molecule is reduced to sugar?
b. What molecule is oxidized to oxygen?
c. Is this an endergonic or exergonic reaction?
Explanation
A
B
C
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Lecture 9 page 8