Question 1

In theory at least, the energy released by the oxidation of one molecule of NADH is sufficient to form ATP molecules).

Accepted Answer

A)  0.5 meaning it takes about 2 NADH to form 1 ATP) 
B)  1 
C)  several 
D)  about 20 
E)  about 50 
A)  0.5 meaning it takes about 2 NADH to form 1 ATP) 
B)  1 
C)  several 
D)  about 20 
E)  about 50

Question 2

For a step in a reaction pathway to serve as a control point it should be .

Accepted Answer

A)  irreversible 
B)  endergonic 
C)  far from equilibrium 
D)  Both A and C 
E)  All of the above 
A)  irreversible 
B)  endergonic 
C)  far from equilibrium 
D)  Both A and C 
E)  All of the above

Question 3

The process of dissolving table salt, NaCl, in water involves an increase in entropy.

Accepted Answer

A) True 
 B)False

Question 4

A given cell type tends to maintain relatively constant internal concentrations of inorganic ions, enzymes and metabolites.

Accepted Answer

A) True 
 B)False

Question 5

The percent of genomes involved in intermediary and energy metabolisms in a wide variety of species is about

Accepted Answer

A)  10%. 
B)  15-30%. 
C)  20-50%. 
D)  30% or more. 
A)  10%. 
B)  15-30%. 
C)  20-50%. 
D)  30% or more.

Question 6

Studies of specific enzymes in cells may not give information about cell metabolism since

Accepted Answer

A)  it is difficult to label many enzymes. 
B)  the pathways are too complex. 
C)  many enzymes are mutant ones. 
D)  conditions in isolation may not be like those inside the cell. 
E)  All of the above 
A)  it is difficult to label many enzymes. 
B)  the pathways are too complex. 
C)  many enzymes are mutant ones. 
D)  conditions in isolation may not be like those inside the cell. 
E)  All of the above

Question 7

The flow of material through a metabolic pathway is called the .

Accepted Answer

A)  current 
B)  degree of amplification 
C)  cascade effect 
D)  flux 
A)  current 
B)  degree of amplification 
C)  cascade effect 
D)  flux

Question 8

The phosphoester bond and phosphoanhydride bonds in ATP have the approximately same free energies of hydrolysis.

Accepted Answer

A) True 
 B)False

Question 9

Which statement is false about most metabolic pathways?

Accepted Answer

A)  Most pathways are reversible under physiological conditions. 
B)  Pathways serve to increase the efficiency of energy transfers. 
C)  The rates of pathway reactions vary to respond to changing conditions. 
D)  The enzymes that catalyze reactions in metabolic pathways generally catalyze only a single step. 
A)  Most pathways are reversible under physiological conditions. 
B)  Pathways serve to increase the efficiency of energy transfers. 
C)  The rates of pathway reactions vary to respond to changing conditions. 
D)  The enzymes that catalyze reactions in metabolic pathways generally catalyze only a single step.

Question 10

Which is not generally a molecule used to conserve energy?

Accepted Answer

A)  ATP 
B)  NADH 
C)  FAD 
D)  QH2 
A)  ATP 
B)  NADH 
C)  FAD 
D)  QH2

Question 11

ATP is thermodynamically suited as a carrier of phosphoryl groups because it has one of the highest phosphoryl-group-transfer potentials in cells.

Accepted Answer

A) True 
 B)False

Question 12

Although the CoA thioester is less stable than oxygen esters, it is stable in cells, resisting nonenzymatic hydrolysis at neutral pH values.

Accepted Answer

A) True 
 B)False

Question 13

Metabolic pathways generally have easily distinguished starting and stopping points.

Accepted Answer

A) True 
 B)False

Question 14

By linking a reaction that would not ordinarily proceed to the hydrolysis of ATP, the overall coupled reaction may be completed.

Accepted Answer

A) True 
 B)False

Question 15

The degradation of which class of biochemicals does not significantly contribute to the release of energy to cells?

Accepted Answer

A)  nucleic acids 
B)  proteins 
C)  lipids 
D)  carbohydrates 
A)  nucleic acids 
B)  proteins 
C)  lipids 
D)  carbohydrates

Question 16

Intermediary metabolism is the term applied to reactions that .

Accepted Answer

A)  degrade molecules 
B)  synthesize large molecules such as proteins 
C)  convert glucose to pyruvate 
D)  involve low molecular weight metabolites 
A)  degrade molecules 
B)  synthesize large molecules such as proteins 
C)  convert glucose to pyruvate 
D)  involve low molecular weight metabolites

Question 17

Which statement is not true about catabolic pathways?

Accepted Answer

A)  They have a net release of energy. 
B)  They have a net consumption of ATP. 
C)  They liberate smaller molecules from larger ones. 
D)  They include the citric acid cycle. 
A)  They have a net release of energy. 
B)  They have a net consumption of ATP. 
C)  They liberate smaller molecules from larger ones. 
D)  They include the citric acid cycle.

Question 18

The reactions that digest foods in the mouth, stomach and intestine are classified as reactions.

Accepted Answer

A)  proteolytic cleavage 
B)  hydrolysis 
C)  free radical 
D)  reduction 
A)  proteolytic cleavage 
B)  hydrolysis 
C)  free radical 
D)  reduction

Question 19

Most metabolic reactions occur continuously at a fixed rate.

Accepted Answer

A) True 
 B)False

Question 20

The amount of energy recovered as ATP can be estimated by measuring free energy of hydrolysis of

Accepted Answer

A)  phosphoester bond in ATP. 
B)  phosphoanhydride bonds in ADP. 
C)  phosphoester bond ADP. 
D)  phosphoanhydride bonds in ATP. 
E)  All of the above 
A)  phosphoester bond in ATP. 
B)  phosphoanhydride bonds in ADP. 
C)  phosphoester bond ADP. 
D)  phosphoanhydride bonds in ATP. 
E)  All of the above

Exam 10: Introduction to Metabolism

In theory at least, the energy released by the oxidation of one molecule of NADH is sufficient to form ATP molecules).

For a step in a reaction pathway to serve as a control point it should be .

The process of dissolving table salt, NaCl, in water involves an increase in entropy.

A given cell type tends to maintain relatively constant internal concentrations of inorganic ions, enzymes and metabolites.

The percent of genomes involved in intermediary and energy metabolisms in a wide variety of species is about

Studies of specific enzymes in cells may not give information about cell metabolism since

The flow of material through a metabolic pathway is called the .

The phosphoester bond and phosphoanhydride bonds in ATP have the approximately same free energies of hydrolysis.

Which statement is false about most metabolic pathways?

Which is not generally a molecule used to conserve energy?

ATP is thermodynamically suited as a carrier of phosphoryl groups because it has one of the highest phosphoryl-group-transfer potentials in cells.

Although the CoA thioester is less stable than oxygen esters, it is stable in cells, resisting nonenzymatic hydrolysis at neutral pH values.

Metabolic pathways generally have easily distinguished starting and stopping points.

By linking a reaction that would not ordinarily proceed to the hydrolysis of ATP, the overall coupled reaction may be completed.

The degradation of which class of biochemicals does not significantly contribute to the release of energy to cells?

Intermediary metabolism is the term applied to reactions that .

Which statement is not true about catabolic pathways?

The reactions that digest foods in the mouth, stomach and intestine are classified as reactions.

Most metabolic reactions occur continuously at a fixed rate.

The amount of energy recovered as ATP can be estimated by measuring free energy of hydrolysis of

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

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