BSC 2010 0M04 Quiz (Chapter 8)
*Disclaimer: I have made these problems to the best of my ability. However, this is only an
overview. Not all information/answers are guaranteed to be accurate, and this information may
or may not apply to your class exam. ☺
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Which of the following describes metabolism?
a. All of the chemical reactions in an organism
b. Polymer to monomer reactions that release ATP and break down
c. Monomer to polymer reactions that require ATP to build up
d. None of the above
Only about 40% of the chemical energy stored in a glucose molecule can be accounted
for in the ATP molecules that are generated during cell respiration. The rest turns to
heat energy. What is this an example of?
a. First Law of Thermodynamics
b. Second Law of Thermodynamics
c. Third Law of Thermodynamics
d. None of the above
What is entropy?
a. randomness of a system
b. total energy of a system
c. total heat of a system
d. none of the above
Which of the following describes an anabolic pathway?
a. All of the chemical reactions in an organism
b. Polymer to monomer reactions that release ATP and break down
c. Monomer to polymer reactions that require ATP to build up
d. None of the above
Which of the following describes a catabolic pathway?
a. All of the chemical reactions in an organism
b. Polymer to monomer reactions that release ATP and break down
c. Monomer to polymer reactions that require ATP to build up
d. None of the above
Is photosynthesis an anabolic or catabolic pathway?
a. Catabolic
b. Anabolic
c. Neither
If a reaction is spontaneous, is the value of Gibbs Free Energy going to be positive or
negative?
a. Positive
b. Negative
What is adenosine made of?
a. Adenine and phosphate
b. Adenine and pentose
c. Adenine and deoxyribose
d. Adenine and ribose
9. How is ADP converted back to ATP?
a. A free inorganic phosphate group is added to ADP
b. Hydrolysis
c. It is not possible to convert ADP to ATP
d. Both A and B
10. Are enzymes proteins?
a. All of them are, and all proteins are enzymes
b. All of them are, but not all proteins are enzymes
c. Some of them are, but not all proteins are enzymes
d. None of them are
11. What role do enzymes play in a chemical reaction?
a. Slow down a chemical reaction
b. Speed up a chemical reaction
c. Create chemical reactions
d. Destroy chemical reactions
12. What is a substrate?
a. What enzymes react on
b. The products
c. The enzyme itself
d. The reactants
e. A and D
f. None of the above
13. How do enzymes speed up chemical reactions?
a. Increase activation energy
b. Lower activation energy
c. The research currently available doesn’t entirely answer this question
d. Decreases the total amount of energy needed for a chemical reaction to take
place
14. Which of the following could be a cause of a denatured enzyme?
a. A competitive inhibitor
b. A noncompetitive inhibitor
c. A spike in pH
d. The inability of a substrate to fit to an enzyme
15. Which is the most likely result of a noncompetitive enzyme?
a. The enzyme is slowed down
b. The enzyme is sped up
c. The enzyme is completely stopped
d. The enzyme is denatured
16. What is a competitive inhibitor?
a. An inhibitor that moves into the active site of the enzyme
b. An inhibitor that moves into non-active site and changes conformation of a
protein
c. An inhibitor that denatures that enzyme
d. An inhibitor that destroys the substrate before it can bind to the active site
17. Which of the following is not true of ATP?
a. It is formed by attaching a phosphate group to ADP with a high energy bond
b. In most reactions involving ATP, only the outer, high energy bond is hydrolyzed
c. It is a good long-term energy storage molecule
d. When dephosphorylated, ATP becomes ADP
18. Which of the following is not true of an enzyme?
a. Enzymes are catalytic proteins that allow spontaneous reactions to occur
b. Enzymes lower the amount of activation energy needed for a reaction
c. Enzymes can be visualized by the lock and key model
d. If all enzymes are completely saturated with substrates, the only way to continue
speeding up the reaction is to add more enzymes rather than more substrates
e. All of the above are true statements
19. A roller coaster is sitting at the top of a hill, about to drop off. Which of the following
best describes the energy present?
a. Potential Energy
b. Chemical Energy
c. Kinetic Energy
d. Heat Energy
20. If a certain process increases entropy, what do we expect of this process?
a. It will require an energy input to occur
b. It will not require energy, and will occur spontaneously
c. Neither
d. Both
21. T or F. Cellular Respiration is a spontaneous process, but still requires the assistance of
enzymes to function properly.
a. True
b. False
22. Does a cell earn or spend ATP in an exergonic reaction, and will delta G be positive or
negative?
a. earn, positive
b. earn, negative
c. spend, positive
d. spend, positive
23. In an endergonic reaction, do the products or reactant have more energy?
a. Reactants
b. Products
24. T or F. Once EA (energy of activation) is reached, the system requires no more input of
energy, and will essentially be a downhill reaction.
a. True
b. False
*Solutions will be posted separately. Be sure to work out the problems to the best of your
ability before viewing the answers. I know it is tempting to just look at the solution, but you got
this! Try your best. ☺