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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 energy and potential energy.
A)True
B)False
3

The first law states that energy cannot be created or destroyed although it may change form; 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 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

Living organisms are able to decrease their entropy and maintain high internal order because the biosphere is an open system from which energy can be captured and used.
A)True
B)False
8

An enzyme is...
A)Highly specific and catalyzes only one reaction
B)Affected by the metabolite environment of its cell
C)Stable and may repeat its specific reaction billions of times
D)Denatured by high temperatures
E)All of the above are correct
9

An enzyme binds its reactant (the substrate) onto an active site in a highly specific fit.
A)True
B)False
10

ATP is generated as oxygen ions flow down their electrochemical gradient through ATP synthase molecules located in the inner mitochondrial membrane.
A)True
B)False
11

Enzyme-catalyzed reactions are not reversible.
A)True
B)False
12

Which of the following is mismatched?
A)Excess amino acids-used as fuel by cells
B)Phosphoanhydride bonds-high energy bonds of ATP
C)ATP-energy-coupling agent, not a fuel
D)Fatty acids-degraded by sequential removal of 2-carbon units
E)All of the above are correct
13

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
14

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
15

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
16

Which of the following is mismatched?
A)Pyruvic acid-a 3-carbon fragment
B)Acetyl Coenzyme A-an intermediate in respiration
C)NADH and FADH2-carriers of hydrogen ions
D)Electron transport chain-chemiosmotic coupling
E)All of the above are correct
17

The net yield from the complete respiration of one molecule of glucose is about 36 ATP.
A)True
B)False
18

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
19

Which of the following fuels are the greatest per gram energy reserve in the body?
A)Proteins
B)Carbohydrates
C)Nucleic acids
D)Fats
E)None of the above is correct
20

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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