Question 1

In which stage of catabolism is the citric acid cycle found?

Accepted Answer

The answer of In which stage of catabolism is the...

Question 2

Draw the structure of a fatty acyl-CoA.

Accepted Answer

The answer of Draw the structure of a fatty acyl-CoA....

Question 3

During the first stage of catabolism,proteins are converted to amino acids through an enzyme-catalyzed

Accepted Answer

A) oxidation reaction. 
B) reduction reaction. 
C) isomerization reaction. 
D) acyl group transfer reaction. 
E) hydrolysis reaction. 
A) oxidation reaction. 
B) reduction reaction. 
C) isomerization reaction. 
D) acyl group transfer reaction. 
E) hydrolysis reaction.

Question 4

What enzyme catalyzes the conversion of glycerol-6-phosphate to dihydroxyacetone phosphate?

Accepted Answer

glycerol p

Question 5

Which of the following is involved in the biosynthesis of amino acids?

Accepted Answer

A) α-ketoglutarate 
B) pyruvate 
C) oxaloacetate 
D) 3-phosphoglycerate 
E) all of the above 
A) α-ketoglutarate 
B) pyruvate 
C) oxaloacetate 
D) 3-phosphoglycerate 
E) all of the above

Question 6

Why does phosphorylating a carboxylate make it more susceptible to nucleophilic attack?

Accepted Answer

Phosphorylating a ca

Question 7

Fatty acyl-CoA is converted to acteyl-CoA in a repeating pathway called

Accepted Answer

A) glycolysis. 
B) b-oxidation. 
C) oxidative phosphorylation. 
D) the citric acid cycle. 
E) phosphoryl transfer. 
A) glycolysis. 
B) b-oxidation. 
C) oxidative phosphorylation. 
D) the citric acid cycle. 
E) phosphoryl transfer.

Question 8

How many citric acid cycles would be needed to produce nine molecules of NADH?

Accepted Answer

A) nine citric acid cycles 
B) one citric acid cycle 
C) two citric acid cycles 
D) four citric acid cycles 
E) three citric acid cycles 
A) nine citric acid cycles 
B) one citric acid cycle 
C) two citric acid cycles 
D) four citric acid cycles 
E) three citric acid cycles

Question 9

In glycolysis,conversion of a molecule of glucose into 2 molecules of pyruvate results in a net production of ________ molecules of ATP.

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 6 
E) 12 
A) 2 
B) 3 
C) 4 
D) 6 
E) 12

Question 10

Describe what's happening mechanistically when glucose reacts with ATP to yield glucose-6-phosphate.

Accepted Answer

The primary hydroxyl at the C-

Question 11

The first reaction in the b-oxidation pathway produces

Accepted Answer

A) an a,b-unsaturated fatty acyl-CoA. 
B) a b-hydroxy fatty acyl-CoA. 
C) an a-hydroxy fatty acyl-CoA. 
D) a b-keto fatty acyl-CoA. 
E) an a-keto fatty acyl-CoA. 
A) an a,b-unsaturated fatty acyl-CoA. 
B) a b-hydroxy fatty acyl-CoA. 
C) an a-hydroxy fatty acyl-CoA. 
D) a b-keto fatty acyl-CoA. 
E) an a-keto fatty acyl-CoA.

Question 12

Give the product from the beta-oxidation of a fatty acyl-CoA.

Accepted Answer

acetyl-CoA

Question 13

What coenzymes are required for the b-oxidation pathway?

Accepted Answer

A) CoASH only 
B) FAD and CoASH only 
C) NAD+ and FAD only 
D) NAD+ and CoASH only 
E) FAD,NAD+,and CoASH 
A) CoASH only 
B) FAD and CoASH only 
C) NAD+ and FAD only 
D) NAD+ and CoASH only 
E) FAD,NAD+,and CoASH

Question 14

Identify the first step of the citric acid cycle.

Accepted Answer

A) Citrate is converted to isocitrate. 
B) Conjugate addition of water to the double bond of fumarate forms (S)-malate. 
C) Acetyl-CoA reacts with oxaloacetate to form citrate. 
D) FAD oxidizes succinate to fumarate. 
E) The secondary alcohol of isocitrate is oxidized to a ketone by NAD+ and the ketone loses CO2. 
A) Citrate is converted to isocitrate. 
B) Conjugate addition of water to the double bond of fumarate forms (S)-malate. 
C) Acetyl-CoA reacts with oxaloacetate to form citrate. 
D) FAD oxidizes succinate to fumarate. 
E) The secondary alcohol of isocitrate is oxidized to a ketone by NAD+ and the ketone loses CO2.

Question 15

A kinase is an enzyme that

Accepted Answer

A) conversion of glycerol-6-phosphate to dihydroxyacetone phosphate. 
B) puts a phosphoryl group on its substrate. 
C) removes a phosphoryl group from its substrate. 
D) catalyzes an irreversible reaction near the beginning of the pathway. 
E) none of the above 
A) conversion of glycerol-6-phosphate to dihydroxyacetone phosphate. 
B) puts a phosphoryl group on its substrate. 
C) removes a phosphoryl group from its substrate. 
D) catalyzes an irreversible reaction near the beginning of the pathway. 
E) none of the above

Question 16

In what three areas of the body does first stage catabolism primarily occur?

Accepted Answer

mouth,stom

Question 17

For each molecule of NADH that undergoes oxidative phosphorylation,________ molecule(s)of ATP is (are)formed.

Accepted Answer

A) 3 
B) 0 
C) 1 
D) 2 
E) 4 
A) 3 
B) 0 
C) 1 
D) 2 
E) 4

Question 18

Under anaerobic conditions in yeast cells,pyruvate is converted to acetaldehyde and ________,with the acetaldehyde being subsequently converted to ________ in a step that reoxidizes NADH to NAD+.

Accepted Answer

carbon dio

Question 19

For every acetyl-CoA molecule that enters the citric acid cycle,________ molecules of ATP ultimately result when both the ATP generated directly by the cycle and ATP generated from oxidative phosphorylation of NAD and FADH2 are counted.

Accepted Answer

A) 12 
B) 2 
C) 3 
D) 6 
E) 11 
A) 12 
B) 2 
C) 3 
D) 6 
E) 11

Question 20

In glycolysis,each molecule of glucose is converted to two molecules of

Accepted Answer

A) pyruvate. 
B) acetaldehyde. 
C) 1,3-dihydroxyacetone. 
D) acetyl-CoA. 
E) glycerol. 
A) pyruvate. 
B) acetaldehyde. 
C) 1,3-dihydroxyacetone. 
D) acetyl-CoA. 
E) glycerol.

Exam 24: The Organic Chemistry of the Metabolic Pathways

In which stage of catabolism is the citric acid cycle found?

Draw the structure of a fatty acyl-CoA.

During the first stage of catabolism,proteins are converted to amino acids through an enzyme-catalyzed

What enzyme catalyzes the conversion of glycerol-6-phosphate to dihydroxyacetone phosphate?

Which of the following is involved in the biosynthesis of amino acids?

Why does phosphorylating a carboxylate make it more susceptible to nucleophilic attack?

Fatty acyl-CoA is converted to acteyl-CoA in a repeating pathway called

How many citric acid cycles would be needed to produce nine molecules of NADH?

In glycolysis,conversion of a molecule of glucose into 2 molecules of pyruvate results in a net production of ________ molecules of ATP.

Describe what's happening mechanistically when glucose reacts with ATP to yield glucose-6-phosphate.

The first reaction in the b-oxidation pathway produces

Give the product from the beta-oxidation of a fatty acyl-CoA.

What coenzymes are required for the b-oxidation pathway?

Identify the first step of the citric acid cycle.

A kinase is an enzyme that

In what three areas of the body does first stage catabolism primarily occur?

For each molecule of NADH that undergoes oxidative phosphorylation,________ molecule(s)of ATP is (are)formed.

Under anaerobic conditions in yeast cells,pyruvate is converted to acetaldehyde and ________,with the acetaldehyde being subsequently converted to ________ in a step that reoxidizes NADH to NAD+.

For every acetyl-CoA molecule that enters the citric acid cycle,________ molecules of ATP ultimately result when both the ATP generated directly by the cycle and ATP generated from oxidative phosphorylation of NAD and FADH2 are counted.

In glycolysis,each molecule of glucose is converted to two molecules of

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 Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Under anaerobic conditions in yeast cells,pyruvate is converted to acetaldehyde and ,with the acetaldehyde being subsequently converted to in a step that reoxidizes NADH to NAD⁺.

For every acetyl-CoA molecule that enters the citric acid cycle,________ molecules of ATP ultimately result when both the ATP generated directly by the cycle and ATP generated from oxidative phosphorylation of NAD and FADH₂ are counted.