Question 1

Give the purpose of FAD and FMN.

Accepted Answer

They are c

Question 2

Which of the following statements is not true about the coenzyme tetrahydrofolate (THF)?

Accepted Answer

A) There are six different THF-coenzymes. 
B) The coenzyme is used by enzyme-catalyzing reactions that donate a group containing a single carbon to their substrate. 
C) THF results from the reduction of two double bonds of the precursor vitamin (folate). 
D) Mammals synthesize the vitamin (folate)but bacteria cannot. 
E) Homocysteine methyl transferase and glycinamide ribonucleotide are examples of enzymes that require THF-coenzyme. 
A) There are six different THF-coenzymes. 
B) The coenzyme is used by enzyme-catalyzing reactions that donate a group containing a single carbon to their substrate. 
C) THF results from the reduction of two double bonds of the precursor vitamin (folate). 
D) Mammals synthesize the vitamin (folate)but bacteria cannot. 
E) Homocysteine methyl transferase and glycinamide ribonucleotide are examples of enzymes that require THF-coenzyme.

Question 3

Vitamin B2 is used to form the coenzyme(s)

Accepted Answer

A) NAD+ and NADH. 
B) FAD and FADH2. 
C) TTP. 
D) CoASH. 
E) THF. 
A) NAD+ and NADH. 
B) FAD and FADH2. 
C) TTP. 
D) CoASH. 
E) THF.

Question 4

What metal ion is also required by biotin-dependent enzymes?

Accepted Answer

The answer of What metal ion is also required by...

Question 5

What is the major organic product of this oxidation-reduction reaction?

Accepted Answer

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

Question 6

Which of the following reactions of amino acids is not catalyzed by PLP-requiring enzymes?

Accepted Answer

A) decarboxylation 
B) transamination 
C) α,β-elimination 
D) α-keto esterification 
E) Cα-Cβ bond cleavage 
A) decarboxylation 
B) transamination 
C) α,β-elimination 
D) α-keto esterification 
E) Cα-Cβ bond cleavage

Question 7

Propose a mechanism for the following reaction.

Accepted Answer

The answer of Propose a mechanism for the following reaction....

Question 8

Which of the following statements best describes what an "electron sink" is?

Accepted Answer

A) a free radical initiator for enzyme catalysis 
B) a site for electron localization 
C) a site for electron delocalization 
D) a site that donates electrons for enzyme catalysis 
E) a site that accepts electrons for enzyme catalysis 
A) a free radical initiator for enzyme catalysis 
B) a site for electron localization 
C) a site for electron delocalization 
D) a site that donates electrons for enzyme catalysis 
E) a site that accepts electrons for enzyme catalysis

Question 9

At what position on the following coenzyme (FAD/FMN)will oxidation-reduction reactions take place?

Accepted Answer

A) 6 
B) 2 
C) 3 
D) 4 
E) 5 
A) 6 
B) 2 
C) 3 
D) 4 
E) 5

Question 10

At what position of the pyridinium ring in the coenzyme below will oxidation-reduction reactions take place?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 11

Give the purpose of biotin.

Accepted Answer

Biotin is the coenzy

Question 12

Which of the following statements is not true about the structure of vitamin B12?

Accepted Answer

A) The structure was determined by Dorothy Hodgkin in 1955 using X-ray crystallography. 
B) The structure has an adenosyl group. 
C) The structure has a cyano group,HO-,or H2O. 
D) The cyano group is coordinated to cobalt. 
E) The structure cannot be synthesized by plants and animals. 
A) The structure was determined by Dorothy Hodgkin in 1955 using X-ray crystallography. 
B) The structure has an adenosyl group. 
C) The structure has a cyano group,HO-,or H2O. 
D) The cyano group is coordinated to cobalt. 
E) The structure cannot be synthesized by plants and animals.

Question 13

The thymine molecule used for the biosynthesis of DNA is synthesized from uracil as shown below.   The structure of dTMP is a methylated dUMP.What is the structure of dTMP?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 14

Identify the compound below.

Accepted Answer

A) pyridoxine 
B) ascorbic acid 
C) thiamine 
D) lipoate 
E) niacin 
A) pyridoxine 
B) ascorbic acid 
C) thiamine 
D) lipoate 
E) niacin

Question 15

Identify all true statement(s).You may choose more than one answer.

Accepted Answer

A) NADH is oxidized to NAD+. 
B) NADPH is oxidized to NADP+. 
C) NADH is reduced to NAD+. 
D) NADPH is reduced to NADP+. 
E) NAD+ is oxidized to NADH. 
A) NADH is oxidized to NAD+. 
B) NADPH is oxidized to NADP+. 
C) NADH is reduced to NAD+. 
D) NADPH is reduced to NADP+. 
E) NAD+ is oxidized to NADH.

Question 16

Which of the following vitamins is involved in the catalysis of an acyl transfer reaction?

Accepted Answer

A) vitamin B1 
B) folic acid 
C) vitamin B12 
D) biotin 
E) lipoic acid 
A) vitamin B1 
B) folic acid 
C) vitamin B12 
D) biotin 
E) lipoic acid

Question 17

List the four stages of catabolism and briefly explain the significance of each.

Accepted Answer

The first stage of catabolism is called

Question 18

What does the term "Pyridoxal" stand for?

Accepted Answer

A) Pyridine aldehyde 
B) Pyrrol oxyaldehyde 
C) Pyrrolidine oxyaldehyde 
D) Peroxy aldehyde 
E) Pyrimidoxy aldehyde 
A) Pyridine aldehyde 
B) Pyrrol oxyaldehyde 
C) Pyrrolidine oxyaldehyde 
D) Peroxy aldehyde 
E) Pyrimidoxy aldehyde

Question 19

Which coenzyme is needed in the conversion of b-aspartate-semialdehyde to homoserine,a reduction reaction?

Accepted Answer

A) NADPH 
B) biotin 
C) PLP 
D) lipoate 
E) THF 
A) NADPH 
B) biotin 
C) PLP 
D) lipoate 
E) THF

Question 20

Which of the following is not true about catabolic reactions?

Accepted Answer

A) Catabolic reactions require NAD+ for a coenzyme. 
B) Catabolic reactions are most often oxidation reactions. 
C) Catabolic reactions are most often reduction reactions. 
D) Catabolic reactions require an oxidizing coenzyme. 
E) Catabolic reactions break down complex molecules into simpler ones. 
A) Catabolic reactions require NAD+ for a coenzyme. 
B) Catabolic reactions are most often oxidation reactions. 
C) Catabolic reactions are most often reduction reactions. 
D) Catabolic reactions require an oxidizing coenzyme. 
E) Catabolic reactions break down complex molecules into simpler ones.

Exam 23: The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

Give the purpose of FAD and FMN.

Which of the following statements is not true about the coenzyme tetrahydrofolate (THF)?

Vitamin B2 is used to form the coenzyme(s)

What metal ion is also required by biotin-dependent enzymes?

What is the major organic product of this oxidation-reduction reaction?

Which of the following reactions of amino acids is not catalyzed by PLP-requiring enzymes?

Propose a mechanism for the following reaction.

Which of the following statements best describes what an "electron sink" is?

At what position on the following coenzyme (FAD/FMN)will oxidation-reduction reactions take place?

At what position of the pyridinium ring in the coenzyme below will oxidation-reduction reactions take place?

Give the purpose of biotin.

Which of the following statements is not true about the structure of vitamin B12?

The thymine molecule used for the biosynthesis of DNA is synthesized from uracil as shown below. The structure of dTMP is a methylated dUMP.What is the structure of dTMP?

Identify the compound below.

Identify all true statement(s).You may choose more than one answer.

Which of the following vitamins is involved in the catalysis of an acyl transfer reaction?

List the four stages of catabolism and briefly explain the significance of each.

What does the term "Pyridoxal" stand for?

Which coenzyme is needed in the conversion of b-aspartate-semialdehyde to homoserine,a reduction reaction?

Which of the following is not true about catabolic reactions?

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Isomers: the Arrangement of Atoms in Space

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

Radicals

Mass Spectrometry,infrared Spectroscopy,and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Amino Acids,peptides,and Proteins

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Metabolic Pathways

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Vitamin B₂ is used to form the coenzyme(s)

Which of the following statements is not true about the structure of vitamin B₁₂?