Question 1

Which in not a lipid-soluble vitamin?

Accepted Answer

A)  A 
B)  C 
C)  E 
D)  K 
A)  A 
B)  C 
C)  E 
D)  K B

Question 2

What is the prosthetic group of the retinal vision protein rhodopsin?

Accepted Answer

A)  retinol 
B)  retinal 
C)  retinoic acid 
D)  β-carotene 
A)  retinol 
B)  retinal 
C)  retinoic acid 
D)  β-carotene B

Question 3

Organic compounds are coenzymes and cofactors while inorganic ions are cofactors only.

Accepted Answer

A) True 
 B)False  True

Question 4

When NAD+ is reduced, the UV absorbance at 340 nm

Accepted Answer

A)  decreases. 
B)  increases. 
C)  stays the same. 
D)  decreases, then increases. 
E)  increases, then decreases. 
A)  decreases. 
B)  increases. 
C)  stays the same. 
D)  decreases, then increases. 
E)  increases, then decreases.

Question 5

Enzymes with vitamin B6 as the prosthetic group catalyze a variety of reactions involving

Accepted Answer

A)  lipids. 
B)  sugars. 
C)  amino acids. 
D)  other vitamins. 
A)  lipids. 
B)  sugars. 
C)  amino acids. 
D)  other vitamins.

Question 6

Metalloenzymes contain metal ions which are bound tightly to the protein and can attract electrons.

Accepted Answer

A) True 
 B)False

Question 7

The reactive center of coenzyme A is

Accepted Answer

A)  ADP. 
B)  pantothenate. 
C)  b-alanine. 
D)  2-mercaptoethylamine. 
E)  serine. 
A)  ADP. 
B)  pantothenate. 
C)  b-alanine. 
D)  2-mercaptoethylamine. 
E)  serine.

Question 8

Because coenzymes are specific for the chemical groups that they accept and donate, they are referred to as

Accepted Answer

A)  cofactors. 
B)  reactive centers. 
C)  activator ions. 
D)  group-transfer reagents. 
E)  All of the above 
A)  cofactors. 
B)  reactive centers. 
C)  activator ions. 
D)  group-transfer reagents. 
E)  All of the above

Question 9

Which structure is not a part of folate?

Accepted Answer

A)  porphyrin ring 
B)  p-aminobenzoic acid 
C)  pterin 
D)  glutamate residues 
A)  porphyrin ring 
B)  p-aminobenzoic acid 
C)  pterin 
D)  glutamate residues

Question 10

Match each of the following vitamins with an associate nutritional deficiency disease.  
-Biotin

Accepted Answer

The answer of Match each of the following vitamins with...

Question 11

Which is the strongest oxidizing agent?

Accepted Answer

A)  ubiquinone 
B)  NAD+  
C)  FMN 
D)  Vitamin K 
A)  ubiquinone 
B)  NAD+  
C)  FMN 
D)  Vitamin K

Question 12

Vitamin A is produced from b-carotene by a condensation reaction.

Accepted Answer

A) True 
 B)False

Question 13

Which coenzyme links to a lysine residue in a proteinʹs active site?

Accepted Answer

A)  biotin 
B)  lipoic acid lipoamide) 
C)  pyridoxal phosphate 
D)  biotin and pyridoxal phosphate only 
E)  All three; biotin, lipoic acid and pyridoxal phosphate 
A)  biotin 
B)  lipoic acid lipoamide) 
C)  pyridoxal phosphate 
D)  biotin and pyridoxal phosphate only 
E)  All three; biotin, lipoic acid and pyridoxal phosphate

Question 14

Which substance would make a good ligand for biotin on the matrix of an affinity chromatography column?

Accepted Answer

A)  ubiquinone 
B)  avidin 
C)  oxaloacetate 
D)  any molecule with an -SH group 
A)  ubiquinone 
B)  avidin 
C)  oxaloacetate 
D)  any molecule with an -SH group

Question 15

In which type of reactions does Q participate?

Accepted Answer

A)  One electron transfers only. 
B)  One or two electron transfers. 
C)  Hydride ion transfers. 
D)  Acetyl group transfers. 
A)  One electron transfers only. 
B)  One or two electron transfers. 
C)  Hydride ion transfers. 
D)  Acetyl group transfers.

Question 16

The corrin ring is very similar to a heme, but the corrin ring containing vitamin B12 has a cobalt ion rather than an iron ion as in heme.

Accepted Answer

A) True 
 B)False

Question 17

Tetrahydrofolate is a more oxidized form of the vitamin folate from which it is derived.

Accepted Answer

A) True 
 B)False

Question 18

Which statement is false about plastoquinone?

Accepted Answer

A)  It is water soluble. 
B)  It is important in photosynthetic electron transport. 
C)  It contains five-carbon isoprenoid units. 
D)  It can be converted to a semiquinone form. 
A)  It is water soluble. 
B)  It is important in photosynthetic electron transport. 
C)  It contains five-carbon isoprenoid units. 
D)  It can be converted to a semiquinone form.

Question 19

The degradation of aspartic acid to oxaloacetic acid and NH4+ is catalyzed by an enzyme with as its prosthetic group.

Accepted Answer

A)  thiamine 
B)  biotin 
C)  pyridoxal phosphate 
D)  vitamin B12 
A)  thiamine 
B)  biotin 
C)  pyridoxal phosphate 
D)  vitamin B12

Question 20

Match each of the following vitamins with an associate nutritional deficiency disease.  
-Cobalamin B12)

Accepted Answer

Exam 7: Coenzymes and Vitamins

Which in not a lipid-soluble vitamin?

What is the prosthetic group of the retinal vision protein rhodopsin?

Organic compounds are coenzymes and cofactors while inorganic ions are cofactors only.

When NAD+ is reduced, the UV absorbance at 340 nm

Enzymes with vitamin B6 as the prosthetic group catalyze a variety of reactions involving

Metalloenzymes contain metal ions which are bound tightly to the protein and can attract electrons.

The reactive center of coenzyme A is

Because coenzymes are specific for the chemical groups that they accept and donate, they are referred to as

Which structure is not a part of folate?

Match each of the following vitamins with an associate nutritional deficiency disease. -Biotin

Which is the strongest oxidizing agent?

Vitamin A is produced from b-carotene by a condensation reaction.

Which coenzyme links to a lysine residue in a proteinʹs active site?

Which substance would make a good ligand for biotin on the matrix of an affinity chromatography column?

In which type of reactions does Q participate?

The corrin ring is very similar to a heme, but the corrin ring containing vitamin B12 has a cobalt ion rather than an iron ion as in heme.

Tetrahydrofolate is a more oxidized form of the vitamin folate from which it is derived.

Which statement is false about plastoquinone?

The degradation of aspartic acid to oxaloacetic acid and NH4+ is catalyzed by an enzyme with as its prosthetic group.

Match each of the following vitamins with an associate nutritional deficiency disease. -Cobalamin B12)

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

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

When NAD⁺is reduced, the UV absorbance at 340 nm

Enzymes with vitamin B₆as the prosthetic group catalyze a variety of reactions involving

The corrin ring is very similar to a heme, but the corrin ring containing vitamin B₁₂has a cobalt ion rather than an iron ion as in heme.

The degradation of aspartic acid to oxaloacetic acid and NH₄⁺is catalyzed by an enzyme with as its prosthetic group.

Match each of the following vitamins with an associate nutritional deficiency disease. -Cobalamin B₁₂)