Question 1

How many molecules of NADH are obtained for each acetyl CoA molecule that enters the common catabolic pathway?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 2

Which of the following statements is true of the concentration of protons in a mitochondrion?

Accepted Answer

A)  The intermembrane space and the matrix contain an equal concentration of protons. 
B)  The intermembrane space contains a higher concentration of protons than the matrix. 
C)  The intermembrane space contains a lower concentration of protons than the matrix. 
D)  The proton concentration in the intermembrane space keeps changing with respect to the matrix. 
A)  The intermembrane space and the matrix contain an equal concentration of protons. 
B)  The intermembrane space contains a higher concentration of protons than the matrix. 
C)  The intermembrane space contains a lower concentration of protons than the matrix. 
D)  The proton concentration in the intermembrane space keeps changing with respect to the matrix.

Question 3

Which of the following vitamins is a structural component of coenzyme A?

Accepted Answer

A)  riboflavin 
B)  folic acid 
C)  tocopherol 
D)  pantothenic acid 
A)  riboflavin 
B)  folic acid 
C)  tocopherol 
D)  pantothenic acid

Question 4

How many molecules of O2 are consumed for each acetyl CoA molecule that enters the common catabolic pathway?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 5

How many distinct steps does the citric acid cycle contain?

Accepted Answer

A)  4 
B)  6 
C)  8 
D)  10 
A)  4 
B)  6 
C)  8 
D)  10

Question 6

Which of the following elements is found in complex II of the electron and H+ transport chain?

Accepted Answer

A)  calcium 
B)  cobalt 
C)  iron 
D)  none of these 
A)  calcium 
B)  cobalt 
C)  iron 
D)  none of these

Question 7

How much energy is released during the hydrolysis of a phosphoric ester bond?

Accepted Answer

A)  3.4 kcal/mol 
B)  7.3 kcal/mol 
C)  10.7 kcal/mol 
D)  18 kcal/mol 
A)  3.4 kcal/mol 
B)  7.3 kcal/mol 
C)  10.7 kcal/mol 
D)  18 kcal/mol

Question 8

Which of the following nucleotides releases the least energy on hydrolysis?

Accepted Answer

A)  ADP 
B)  AMP 
C)  ATP 
D)  All of these release equal amounts of energy. 
A)  ADP 
B)  AMP 
C)  ATP 
D)  All of these release equal amounts of energy.

Question 9

Why are compounds such as 2,4-dinitrophenol used as weight-reducing drugs?

Accepted Answer

A)  They induce weight loss by blocking lipases. 
B)  They induce weight loss by inhibiting ATP production. 
C)  They induce weight loss by blocking the enzymes of the citric acid cycle. 
D)  None of these statements is correct. 
A)  They induce weight loss by blocking lipases. 
B)  They induce weight loss by inhibiting ATP production. 
C)  They induce weight loss by blocking the enzymes of the citric acid cycle. 
D)  None of these statements is correct.

Question 10

Identify a metabolic pathway associated with the enzymes localized on the mitochondrial cristae.

Accepted Answer

A)  the citric acid cycle 
B)  the electron transport chain 
C)  the citric acid cycle and the electron transport chain 
D)  none of these 
A)  the citric acid cycle 
B)  the electron transport chain 
C)  the citric acid cycle and the electron transport chain 
D)  none of these

Question 11

Which of the following reactions occurs during the conversion of α-ketoglutarate to succinate in the citric acid cycle?

Accepted Answer

A)  oxidative carboxylation 
B)  oxidative decarboxylation 
C)  reductive carboxylation 
D)  reductive decarboxylation 
A)  oxidative carboxylation 
B)  oxidative decarboxylation 
C)  reductive carboxylation 
D)  reductive decarboxylation

Question 12

The reaction between NADH and CoQ releases some energy. How is this energy used in a cell?

Accepted Answer

A)  It is used to transport electrons from the intermembrane space to the matrix of mitochondria. 
B)  It is used to transport electrons from the matrix to the intermembrane space of the mitochondria. 
C)  It is used to transport protons from the intermembrane space to the matrix of mitochondria. 
D)  It is used to transport protons from the matrix to the intermembrane space of the mitochondria. 
A)  It is used to transport electrons from the intermembrane space to the matrix of mitochondria. 
B)  It is used to transport electrons from the matrix to the intermembrane space of the mitochondria. 
C)  It is used to transport protons from the intermembrane space to the matrix of mitochondria. 
D)  It is used to transport protons from the matrix to the intermembrane space of the mitochondria.

Question 13

Which of the following amino acid residues gets phosphorylated to activate the enzyme phosphofructokinase-2?

Accepted Answer

A)  alanine 
B)  cysteine 
C)  serine 
D)  tryptophan 
A)  alanine 
B)  cysteine 
C)  serine 
D)  tryptophan

Question 14

In the abbreviations AMP, ADP, and ATP, what does "A" stand for?

Accepted Answer

A)  the alkaloid atropine 
B)  the amino acid alanine 
C)  the amino acid arginine 
D)  the nucleoside adenosine 
A)  the alkaloid atropine 
B)  the amino acid alanine 
C)  the amino acid arginine 
D)  the nucleoside adenosine

Question 15

Which statement best compares the chemical structure of citrate and isocitrate?

Accepted Answer

A)  Both have secondary alcohol groups. 
B)  Both have tertiary alcohol groups. 
C)  Citrate has a secondary alcohol group, whereas isocitrate has a tertiary alcohol group. 
D)  Citrate has a tertiary alcohol group, whereas isocitrate has a secondary alcohol group. 
A)  Both have secondary alcohol groups. 
B)  Both have tertiary alcohol groups. 
C)  Citrate has a secondary alcohol group, whereas isocitrate has a tertiary alcohol group. 
D)  Citrate has a tertiary alcohol group, whereas isocitrate has a secondary alcohol group.

Question 16

Which of the following species of the citric acid cycle is optically active?

Accepted Answer

A)  cis-aconitate 
B)  citrate 
C)  isocitrate 
D)  none of these 
A)  cis-aconitate 
B)  citrate 
C)  isocitrate 
D)  none of these

Question 17

Which of the following is another name for complex IV of the electron and H+ transport chain?

Accepted Answer

A)  cytochrome oxidase 
B)  cytochrome reductase 
C)  ubiquinone 
D)  none of these 
A)  cytochrome oxidase 
B)  cytochrome reductase 
C)  ubiquinone 
D)  none of these

Question 18

What happens when ATP molecules bind to myosin filaments in muscles?

Accepted Answer

A)  Actin-myosin complexes dissociate, leading to muscle contraction. 
B)  Actin-myosin complexes dissociate, leading to muscle relaxation. 
C)  Actin-myosin complexes are formed, leading to muscle contraction. 
D)  Actin-myosin complexes are formed, leading to muscle relaxation. 
A)  Actin-myosin complexes dissociate, leading to muscle contraction. 
B)  Actin-myosin complexes dissociate, leading to muscle relaxation. 
C)  Actin-myosin complexes are formed, leading to muscle contraction. 
D)  Actin-myosin complexes are formed, leading to muscle relaxation.

Question 19

Which of the following is the largest complex of the electron and H+ transport chain?

Accepted Answer

A)  complex I 
B)  complex II 
C)  complex III 
D)  complex IV 
A)  complex I 
B)  complex II 
C)  complex III 
D)  complex IV

Question 20

In the citric acid cycle, which of the following reactions occurs during the conversion of fumarate to malate?

Accepted Answer

A)  dehydration 
B)  hydration 
C)  oxidation 
D)  reduction 
A)  dehydration 
B)  hydration 
C)  oxidation 
D)  reduction

Exam 26: Bioenergetics: How the Body Converts Food to Energy

How many molecules of NADH are obtained for each acetyl CoA molecule that enters the common catabolic pathway?

Which of the following statements is true of the concentration of protons in a mitochondrion?

Which of the following vitamins is a structural component of coenzyme A?

How many molecules of O2 are consumed for each acetyl CoA molecule that enters the common catabolic pathway?

How many distinct steps does the citric acid cycle contain?

Which of the following elements is found in complex II of the electron and H+ transport chain?

How much energy is released during the hydrolysis of a phosphoric ester bond?

Which of the following nucleotides releases the least energy on hydrolysis?

Why are compounds such as 2,4-dinitrophenol used as weight-reducing drugs?

Identify a metabolic pathway associated with the enzymes localized on the mitochondrial cristae.

Which of the following reactions occurs during the conversion of α-ketoglutarate to succinate in the citric acid cycle?

The reaction between NADH and CoQ releases some energy. How is this energy used in a cell?

Which of the following amino acid residues gets phosphorylated to activate the enzyme phosphofructokinase-2?

In the abbreviations AMP, ADP, and ATP, what does "A" stand for?

Which statement best compares the chemical structure of citrate and isocitrate?

Which of the following species of the citric acid cycle is optically active?

Which of the following is another name for complex IV of the electron and H+ transport chain?

What happens when ATP molecules bind to myosin filaments in muscles?

Which of the following is the largest complex of the electron and H+ transport chain?

In the citric acid cycle, which of the following reactions occurs during the conversion of fumarate to malate?

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How many molecules of O₂ are consumed for each acetyl CoA molecule that enters the common catabolic pathway?

Which of the following elements is found in complex II of the electron and H⁺ transport chain?

Which of the following is another name for complex IV of the electron and H⁺ transport chain?

Which of the following is the largest complex of the electron and H⁺ transport chain?