Question 1

The ability and capacity of coenzymes to become oxidized or reduced reduction potential) may be found by

Accepted Answer

A)  measuring the flow of zinc and copper electrons. 
B)  measuring the flow of electrons when compared to hydrogen gas at standard conditions. 
C)  measuring the number of H atoms present. 
D)  All of the above 
A)  measuring the flow of zinc and copper electrons. 
B)  measuring the flow of electrons when compared to hydrogen gas at standard conditions. 
C)  measuring the number of H atoms present. 
D)  All of the above

Question 2

The evolution of biochemical pathways can be studied by

Accepted Answer

A)  isolating pathway enzymes from different individuals. 
B)  comparing pathways in closely related species. 
C)  comparing pathways in many diverse bacteria. 
D)  comparing linear and circular pathways. 
A)  isolating pathway enzymes from different individuals. 
B)  comparing pathways in closely related species. 
C)  comparing pathways in many diverse bacteria. 
D)  comparing linear and circular pathways.

Question 3

Compartmentation of enzymes

Accepted Answer

A)  helps prevent loss by diffusion. 
B)  keeps separate pools of metabolites in cells. 
C)  can help control metabolic pathways. 
D)  All of the above 
A)  helps prevent loss by diffusion. 
B)  keeps separate pools of metabolites in cells. 
C)  can help control metabolic pathways. 
D)  All of the above

Question 4

Consider the synthesis of a biopolymer in which the addition of successive monomers occurs by the same kind of reactions). The synthesis of the polymer is a pathway.

Accepted Answer

A)  linear 
B)  cyclic 
C)  spiral 
D)  branched 
A)  linear 
B)  cyclic 
C)  spiral 
D)  branched

Question 5

The biochemical reactions that degrade molecules, such as nutrients, are called anabolic reactions.

Accepted Answer

A) True 
 B)False

Question 6

ATP can be used to activate a substrate by

Accepted Answer

A)  phosphorylation. 
B)  adding a nucleotidyl group. 
C)  producing inorganic phosphate. 
D)  Both A and B 
A)  phosphorylation. 
B)  adding a nucleotidyl group. 
C)  producing inorganic phosphate. 
D)  Both A and B

Question 7

ATP is thermodynamically suited as a carrier of phosphoryl groups in animal cells because

Accepted Answer

A)  it is stable under cell conditions. 
B)  it is not hydrolyzed in cells without enzyme action. 
C)  it is intermediate in group-transfer potential. 
D)  it can be produced from phosphocreatine. 
E)  All of the above 
A)  it is stable under cell conditions. 
B)  it is not hydrolyzed in cells without enzyme action. 
C)  it is intermediate in group-transfer potential. 
D)  it can be produced from phosphocreatine. 
E)  All of the above

Question 8

Thioesters are similar to oxygen esters of carboxylic acids except that

Accepted Answer

A)  the energy associated with their hydrolysis is much less than that of the phosphoanhydride in ATP. 
B)  they are more stable at neutral pH values in cells. 
C)  they are less stable because S is present instead of O in the linkage. 
D)  they are used in glycolysis and the citric acid cycle. 
E)  they are not hydrolyzed enzymatically. 
A)  the energy associated with their hydrolysis is much less than that of the phosphoanhydride in ATP. 
B)  they are more stable at neutral pH values in cells. 
C)  they are less stable because S is present instead of O in the linkage. 
D)  they are used in glycolysis and the citric acid cycle. 
E)  they are not hydrolyzed enzymatically.

Question 9

Levels of ATP and ADP are partly maintained in cells by

Accepted Answer

A)  phosphoglucomutase. 
B)  the ADP concentration. 
C)  adenylate kinase. 
D)  and equilibrium with dissolved oxygen. 
A)  phosphoglucomutase. 
B)  the ADP concentration. 
C)  adenylate kinase. 
D)  and equilibrium with dissolved oxygen.

Question 10

It would be possible for cells to couple glutathione reduction E° = -0.23) to the oxidation of cytochrome c1 E°ʹ = 0.23).

Accepted Answer

A) True 
 B)False

Question 11

Which statement is false about ATP?

Accepted Answer

A)  Its concentration in a particular cell usually fluctuates very little. 
B)  The concentration of ATP in cells is generally much lower than that of AMP. 
C)  Its concentration is maintained in part by adenylate kinase. 
D)  The intracellular concentration of ATP varies among cell types. 
A)  Its concentration in a particular cell usually fluctuates very little. 
B)  The concentration of ATP in cells is generally much lower than that of AMP. 
C)  Its concentration is maintained in part by adenylate kinase. 
D)  The intracellular concentration of ATP varies among cell types.

Question 12

ATP has the highest possible standard free energy of hydrolysis in cells; therefore it is the most energy-rich compound in living systems.

Accepted Answer

A) True 
 B)False

Question 13

The synthesis of acetyl CoA shows that another important role for ATP in cells is to provide its nucleotidyl group for transfer in metabolism.

Accepted Answer

A) True 
 B)False

Question 14

The free energy for ATP hydrolysis in vivo is actually greater than the standard free energy change of -30 kJ mol-1 because

Accepted Answer

A)  it has stronger electrostatic repulsion. 
B)  of the actual concentrations of ATP and its hydrolysis products in cells. 
C)  it can easily be formed from other nucleotide triphosphates. 
D)  it can participate in phosphoryl group transfers. 
E)  All of the above 
A)  it has stronger electrostatic repulsion. 
B)  of the actual concentrations of ATP and its hydrolysis products in cells. 
C)  it can easily be formed from other nucleotide triphosphates. 
D)  it can participate in phosphoryl group transfers. 
E)  All of the above

Question 15

Phosphorylation of enzymes involved in catabolic pathways usually activates them.

Accepted Answer

A) True 
 B)False

The ability and capacity of coenzymes to become oxidized or reduced reduction potential) may be found by

The evolution of biochemical pathways can be studied by

Compartmentation of enzymes

Consider the synthesis of a biopolymer in which the addition of successive monomers occurs by the same kind of reactions). The synthesis of the polymer is a pathway.

The biochemical reactions that degrade molecules, such as nutrients, are called anabolic reactions.

ATP can be used to activate a substrate by

ATP is thermodynamically suited as a carrier of phosphoryl groups in animal cells because

Thioesters are similar to oxygen esters of carboxylic acids except that

Levels of ATP and ADP are partly maintained in cells by

It would be possible for cells to couple glutathione reduction E° = -0.23) to the oxidation of cytochrome c₁E°^ʹ= 0.23).

Which statement is false about ATP?

ATP has the highest possible standard free energy of hydrolysis in cells; therefore it is the most energy-rich compound in living systems.

The synthesis of acetyl CoA shows that another important role for ATP in cells is to provide its nucleotidyl group for transfer in metabolism.

The free energy for ATP hydrolysis in vivo is actually greater than the standard free energy change of -30 kJ mol^-¹because

Phosphorylation of enzymes involved in catabolic pathways usually activates them.

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

Filters

Exam 10: Introduction to Metabolism

The ability and capacity of coenzymes to become oxidized or reduced reduction potential) may be found by

The evolution of biochemical pathways can be studied by

Compartmentation of enzymes

Consider the synthesis of a biopolymer in which the addition of successive monomers occurs by the same kind of reactions). The synthesis of the polymer is a pathway.

The biochemical reactions that degrade molecules, such as nutrients, are called anabolic reactions.

ATP can be used to activate a substrate by

ATP is thermodynamically suited as a carrier of phosphoryl groups in animal cells because

Thioesters are similar to oxygen esters of carboxylic acids except that

Levels of ATP and ADP are partly maintained in cells by

It would be possible for cells to couple glutathione reduction E° = -0.23) to the oxidation of cytochrome c1 E°ʹ = 0.23).

Which statement is false about ATP?

ATP has the highest possible standard free energy of hydrolysis in cells; therefore it is the most energy-rich compound in living systems.

The synthesis of acetyl CoA shows that another important role for ATP in cells is to provide its nucleotidyl group for transfer in metabolism.

The free energy for ATP hydrolysis in vivo is actually greater than the standard free energy change of -30 kJ mol-1 because

Phosphorylation of enzymes involved in catabolic pathways usually activates them.

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

Filters

It would be possible for cells to couple glutathione reduction E° = -0.23) to the oxidation of cytochrome c₁E°^ʹ= 0.23).

The free energy for ATP hydrolysis in vivo is actually greater than the standard free energy change of -30 kJ mol^-¹because