Question 1

Which enzyme is involved in the conversion of phosphoenolpyruvate to pyruvate?

Accepted Answer

A)  enolase 
B)  ketolase 
C)  pyruvate kinase 
D)  pyruvate oxidase 
A)  enolase 
B)  ketolase 
C)  pyruvate kinase 
D)  pyruvate oxidase

Question 2

Which of the following is not involved in the hydrolysis of proteins?

Accepted Answer

A)  HCl 
B)  NaOH 
C)  intestinal enzymes 
D)  stomach enzymes 
A)  HCl 
B)  NaOH 
C)  intestinal enzymes 
D)  stomach enzymes

Question 3

Which of the following compounds is likely to be present in higher concentrations in the blood during starvation?

Accepted Answer

A)    
B)    
C)    
D)  All of these compounds are likely to be present in higher than normal concentrations. 
A)    
B)    
C)    
D)  All of these compounds are likely to be present in higher than normal concentrations.

Question 4

What is the effect of excess ATP on glycolysis?

Accepted Answer

A)  It enhances the rate of glycolysis. 
B)  It moderately reduces the rate of glycolysis. 
C)  It shuts down glycolysis. 
D)  It has no effect on glycolysis. 
A)  It enhances the rate of glycolysis. 
B)  It moderately reduces the rate of glycolysis. 
C)  It shuts down glycolysis. 
D)  It has no effect on glycolysis.

Question 5

To which of the following types of reaction does the formation of acetone from acetoacetate belong?

Accepted Answer

A)  decarboxylation 
B)  hydrolysis 
C)  reduction 
D)  oxidation 
A)  decarboxylation 
B)  hydrolysis 
C)  reduction 
D)  oxidation

Question 6

Which of the following is a reactant in transamination?

Accepted Answer

A)  α-ketoglutarate 
B)  β-ketoglutarate 
C)  glutamate 
D)  none of these 
A)  α-ketoglutarate 
B)  β-ketoglutarate 
C)  glutamate 
D)  none of these

Question 7

To which of the following processes does the first three steps of glycolysis belong?

Accepted Answer

A)  the activation process 
B)  the initiation process 
C)  the initialization process 
D)  the preparation process 
A)  the activation process 
B)  the initiation process 
C)  the initialization process 
D)  the preparation process

Question 8

Depending on the location of metabolism, how many molecules of ATP are produced from the hydrolysis of a glycerol molecule?

Accepted Answer

A)  3 to 6 
B)  6 to 9 
C)  12.5 to 15.5 
D)  16.5 to 18.5 
A)  3 to 6 
B)  6 to 9 
C)  12.5 to 15.5 
D)  16.5 to 18.5

Question 9

Which of the following is the activated form of fatty acids in the β-oxidation pathway?

Accepted Answer

A)  free fatty acid 
B)  fatty acetyl CoA 
C)  fatty acyl CoA 
D)  all of these 
A)  free fatty acid 
B)  fatty acetyl CoA 
C)  fatty acyl CoA 
D)  all of these

Question 10

Which of the following is a difference between lysine and ornithine?

Accepted Answer

A)  Lysine does not occur in proteins. 
B)  Ornithine does not occur in proteins. 
C)  The side chain of ornithine is cyclic but linear in lysine. 
D)  The side chain of ornithine is linear but cyclic in lysine. 
A)  Lysine does not occur in proteins. 
B)  Ornithine does not occur in proteins. 
C)  The side chain of ornithine is cyclic but linear in lysine. 
D)  The side chain of ornithine is linear but cyclic in lysine.

Question 11

Identify the enzyme that catalyzes the conversion of phenylalanine into tyrosine.

Accepted Answer

A)  phenylalanine dehydrogenase 
B)  phenylalanine kinase 
C)  phenylalanine hydroxylase 
D)  phenylalanine phosphorylase 
A)  phenylalanine dehydrogenase 
B)  phenylalanine kinase 
C)  phenylalanine hydroxylase 
D)  phenylalanine phosphorylase

Question 12

Which of the following statements is true of the amino acids in the amino acid pool?

Accepted Answer

A)  They are never used as a fuel for energy. 
B)  They are occasionally used as a fuel for energy. 
C)  They regulate the degradation of proteins. 
D)  They regulate the level of glucose in the blood. 
A)  They are never used as a fuel for energy. 
B)  They are occasionally used as a fuel for energy. 
C)  They regulate the degradation of proteins. 
D)  They regulate the level of glucose in the blood.

Question 13

Which of the following processes requires NADPH?

Accepted Answer

A)  synthesis of amino acids 
B)  synthesis of cholesterol 
C)  synthesis of unsaturated fatty acids 
D)  all of these 
A)  synthesis of amino acids 
B)  synthesis of cholesterol 
C)  synthesis of unsaturated fatty acids 
D)  all of these

Question 14

What is the relationship between dihydroxyacetone phosphate and glyceraldehyde 3-phosphate?

Accepted Answer

A)  They are anomers of each other. 
B)  They are enantiomers of each other. 
C)  They are isomers of each other. 
D)  They are not related to each other. 
A)  They are anomers of each other. 
B)  They are enantiomers of each other. 
C)  They are isomers of each other. 
D)  They are not related to each other.

Question 15

What is the nature of phenylketonuria?

Accepted Answer

A)  It is a bacterial disease. 
B)  It is a viral disease. 
C)  It is a lifestyle disorder. 
D)  It is a genetic defect. 
A)  It is a bacterial disease. 
B)  It is a viral disease. 
C)  It is a lifestyle disorder. 
D)  It is a genetic defect.

Question 16

To which of the following reactions does the conversion of ribose to deoxyribose belong?

Accepted Answer

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

Question 17

What is the relationship between glucose 6-phosphate and fructose 6-phosphate?

Accepted Answer

A)  They are anomers of each other. 
B)  They are enantiomers of each other. 
C)  They are isomers of each other. 
D)  They are not related to each other. 
A)  They are anomers of each other. 
B)  They are enantiomers of each other. 
C)  They are isomers of each other. 
D)  They are not related to each other.

Question 18

Which of the following pathways is used by cells to obtain energy from fatty acids?

Accepted Answer

A)  α-oxidation 
B)  α-reduction 
C)  β-oxidation 
D)  β-reduction 
A)  α-oxidation 
B)  α-reduction 
C)  β-oxidation 
D)  β-reduction

Question 19

What is the fate of the carbon skeletons of amino acids in amino acid catabolism?

Accepted Answer

A)  They are used as an energy source. 
B)  They are used as a building block for synthesizing other molecules. 
C)  Both of these are the fates of the carbon skeletons in amino acid catabolism. 
D)  Neither of these is the fate of the carbon skeletons in amino acid catabolism. 
A)  They are used as an energy source. 
B)  They are used as a building block for synthesizing other molecules. 
C)  Both of these are the fates of the carbon skeletons in amino acid catabolism. 
D)  Neither of these is the fate of the carbon skeletons in amino acid catabolism.

Question 20

What is the role of phosphofructokinase in glycolysis?

Accepted Answer

A)  It converts fructose into fructose 1-phosphate. 
B)  It converts fructose 1-phosphate into fructose 1,6-bisphosphate. 
C)  It converts fructose 1,6-bisphosphate into glucose 1,6-bisphosphate. 
D)  None of these are correct. 
A)  It converts fructose into fructose 1-phosphate. 
B)  It converts fructose 1-phosphate into fructose 1,6-bisphosphate. 
C)  It converts fructose 1,6-bisphosphate into glucose 1,6-bisphosphate. 
D)  None of these are correct.

Exam 27: Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Which enzyme is involved in the conversion of phosphoenolpyruvate to pyruvate?

Which of the following is not involved in the hydrolysis of proteins?

Which of the following compounds is likely to be present in higher concentrations in the blood during starvation?

What is the effect of excess ATP on glycolysis?

To which of the following types of reaction does the formation of acetone from acetoacetate belong?

Which of the following is a reactant in transamination?

To which of the following processes does the first three steps of glycolysis belong?

Depending on the location of metabolism, how many molecules of ATP are produced from the hydrolysis of a glycerol molecule?

Which of the following is the activated form of fatty acids in the β-oxidation pathway?

Which of the following is a difference between lysine and ornithine?

Identify the enzyme that catalyzes the conversion of phenylalanine into tyrosine.

Which of the following statements is true of the amino acids in the amino acid pool?

Which of the following processes requires NADPH?

What is the relationship between dihydroxyacetone phosphate and glyceraldehyde 3-phosphate?

What is the nature of phenylketonuria?

To which of the following reactions does the conversion of ribose to deoxyribose belong?

What is the relationship between glucose 6-phosphate and fructose 6-phosphate?

Which of the following pathways is used by cells to obtain energy from fatty acids?

What is the fate of the carbon skeletons of amino acids in amino acid catabolism?

What is the role of phosphofructokinase in glycolysis?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters