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Chapter 4 Quiz
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1

Cellular metabolism refers to the collective total of chemical processes that occur within living cells.
A)True
B)False
2

Energy can exist in either of two states: kinetic or potential.
A)True
B)False
3

The first law of thermodynamics states that energy cannot be created or destroyed although it may change from one form to another; the second law states that the structure of systems proceeds toward increasing entropy.
A)True
B)False
4

Which of the following is incorrect?
A)Exergonic—requires that free energy is lost from the system
B)Endergonic—requires the addition of free energy to the system
C)Enzymes—inorganic catalysts
D)Activation energy—energy that must be supplied to stress bonds
E)Cofactors—small nonprotein groups associated with enzymes
5

An enzyme functions by associating in a highly specific way with its substrate, the molecule whose reaction it catalyzes.
A)True
B)False
6

The binding of enzyme to substrate forms a(n)…
A)Ligand
B)Catalyst
C)Coenzyme
D)Enzyme-substrate complex
E)None of the above is correct
7

Enzymes:
A)Are highly specific and catalyze only one reaction
B)Only affect the reaction rate
C)Are stable and may repeat their specific reaction billions of times
D)Participate in reversible reactions
E)All of the above are correct
8

An enzyme associates its substrate in a highly specific fit.
A)True
B)False
9

ATP is formed as oxygen ions flow down the electrochemical gradient through ATP synthase molecules located in the mitochondria.
A)True
B)False
10

Enzyme-catalyzed reactions are not reversible.
A)True
B)False
11

Animals are aerobes that use oxygen as the final electron acceptor in the electron transport chain in the manufacture of ATP.
A)True
B)False
12

When a molecule of glucose is completely oxidized in the presence of oxygen nearly 20 times the energy is released than when it is only degraded to the stage of pyruvic acid.
A)True
B)False
13

In the presence of oxygen, cellular respiration involves several interconnected stages:
A)Glycolysis
B)Krebs cycle
C)Electron transport chain
D)All of the above are phases of complete cellular respiration
E)None of the above is correct
14

Which of the following is mismatched?
A)Pyruvic acid—a 3-carbon fragment
B)Acetyl Coenzyme A—oxidation in Krebs cycle provides energized electrons to generate ATP
C)NADH and FADH2—carriers of hydrogen ions
D)Electron transport chain—chemiosmotic coupling
E)All of the above are correct
15

The net yield from the complete respiration of one molecule of glucose is about 36 ATP.
A)True
B)False
16

Anaerobic glycolysis is only one-eighteenth as efficient as complete oxidation of glucose to carbon dioxide and water, but its key virtue is that it provides some high-energy phosphate in situations in which oxygen is absent or in short supply.
A)True
B)False
17

Which of the following fuels supply the greatest energy reserve in the body?
A)Proteins
B)Carbohydrates
C)Nucleic acids
D)Stored fats
E)None of the above is correct
18

Before an amino acid molecule may enter the fuel depot, nitrogen must be removed by deamination or by transamination, forming two products, a fatty acid and ammonia.
A)True
B)False





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