Question 1

Glucogenic amino acids include all of the following,except:

Accepted Answer

A) Glycine 
B) Alanine 
C) Aspartic acid 
D) Leucine 
E) All of these amino acids are glucogenic. 
A) Glycine 
B) Alanine 
C) Aspartic acid 
D) Leucine 
E) All of these amino acids are glucogenic. D

Question 2

The two nitrogens in urea arise directly from:

Accepted Answer

A) Ammonia and aspartic acid 
B) Carbamoyl phosphate and glutamic acid 
C) Ammonia and glutamic acid 
D) Carbamoyl phosphate and glutamine 
A) Ammonia and aspartic acid 
B) Carbamoyl phosphate and glutamic acid 
C) Ammonia and glutamic acid 
D) Carbamoyl phosphate and glutamine A

Question 3

What reaction does glutamate dehydrogenase (GDH)catalyze?

Accepted Answer

A) The oxidative deamination of glutamate to yield a-ketoglutarate. 
B) Phosphorylation of carbamate to yield carbamoyl phosphate. 
C) The amidation of the g carboxyl group of glutamate to form glutamine. 
D) The deadenylation of glutamine synthetase (GS). 
E) The adenylation of glutamine synthetase. 
A) The oxidative deamination of glutamate to yield a-ketoglutarate. 
B) Phosphorylation of carbamate to yield carbamoyl phosphate. 
C) The amidation of the g carboxyl group of glutamate to form glutamine. 
D) The deadenylation of glutamine synthetase (GS). 
E) The adenylation of glutamine synthetase. A

Question 4

Draw the structure of the product formed when the substance shown below undergoes amide formation.

Accepted Answer

The answer of Draw the structure of the product formed...

Question 5

Amino acids biosynthesized from aspartate include all except:

Accepted Answer

A) asparagine 
B) threonine 
C) methionine 
D) lysine 
E) glutamate 
A) asparagine 
B) threonine 
C) methionine 
D) lysine 
E) glutamate

Question 6

Consider the reaction below to answer the following questions.
  
a) Which group of small molecules best fit the boxes associated with the reaction?

b) This reaction is part of:
a. the citric acid cycle.
b. the urea cycle.
c. a biosynthetic pathway of amino acids
d.the catabolism of amino acid carbon
chains.

Accepted Answer

The answer of Consider the reaction below to answer the...

Question 7

Many biological reactions are endergonic.Explain how it is possible that these reactions occur spontaneously.

Accepted Answer

Endergonic reactions such as the convers

Question 8

In the process of amino acid biosynthesis,how are glutamic acid,glutamine,proline,and arginine all related?

Accepted Answer

A) They are all derived from a-ketoglutarate. 
B) They are all derivatives of acetyl CoA. 
C) They are all derivatives of pyruvate. 
D) They are all derived from aspartate. 
E) They are all derivatives of 3-phosphoglycerate. 
A) They are all derived from a-ketoglutarate. 
B) They are all derivatives of acetyl CoA. 
C) They are all derivatives of pyruvate. 
D) They are all derived from aspartate. 
E) They are all derivatives of 3-phosphoglycerate.

Question 9

All of the following are true of transamination except:

Accepted Answer

A) It is characterized by the transfer of an a-amino group from an amino acid to the a-keto position of an a-keto acid. 
B) The amino donor becomes an a-keto acid. 
C) The coenzyme needed is thiamine diphosphate. 
D) The a-keto acid acceptor becomes an a-amino acid. 
A) It is characterized by the transfer of an a-amino group from an amino acid to the a-keto position of an a-keto acid. 
B) The amino donor becomes an a-keto acid. 
C) The coenzyme needed is thiamine diphosphate. 
D) The a-keto acid acceptor becomes an a-amino acid.

Question 10

The following shows a part of the biosynthetic pathway of amino acids.If possible,draw an arrow to match the amino acid with its precursor.

Accepted Answer

The answer of The following shows a part of the...

Question 11

This many ATP equivalents are required to produce one molecule of urea from ammonia:

Accepted Answer

A) One ATP equivalent. 
B) Two ATP equivalents. 
C) Three ATP equivalents. 
D) Four ATP equivalents. 
E) Six ATP equivalents. 
A) One ATP equivalent. 
B) Two ATP equivalents. 
C) Three ATP equivalents. 
D) Four ATP equivalents. 
E) Six ATP equivalents.

Question 12

The appropriate sequence in the biosynthesis of proline from glutamate is:

Accepted Answer

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

Question 13

Write a mechanism for the formation of a-iminoglutarate from glutamate employing NAD+ as the oxidizing coenzyme.

Accepted Answer

Question 14

The key functional group in the PLP-dependent transamination of an a-amino acid is an activated

Accepted Answer

A) amine 
B) imine 
C) amide 
D) enamine 
A) amine 
B) imine 
C) amide 
D) enamine

Question 15

Write a mechanism for the nonenzymatic transformation of glutamate semialdehyde into 1-pyrroline-5-carboxylate.Which amino acid is synthesized from 1-pyrroline-5-carboxylate in vivo?

Accepted Answer

@#IMG-DLM& proline is synthesi

Question 16

The term ketogenic amino acids refers to amino acids

Accepted Answer

A) that are precursors for glucose synthesis. 
B) that are degraded to yield acetyl CoA or acetoacetate 
C) that can not be converted to fatty acids or ketone bodies. 
D) that are degraded to yield succinyl-CoA,pyruvate,a-ketoglutarate,fumarate and oxaloacetate. 
E) None of these. 
A) that are precursors for glucose synthesis. 
B) that are degraded to yield acetyl CoA or acetoacetate 
C) that can not be converted to fatty acids or ketone bodies. 
D) that are degraded to yield succinyl-CoA,pyruvate,a-ketoglutarate,fumarate and oxaloacetate. 
E) None of these.

Question 17

The carbon skeletons of specific amino acids cannot be used to replenish which of the following species associated with the citric acid cycle?

Accepted Answer

A) pyruvate 
B) citrate 
C) fumarate 
D) succinyl CoA 
E) all of these can be used 
A) pyruvate 
B) citrate 
C) fumarate 
D) succinyl CoA 
E) all of these can be used

Question 18

The coenzyme pyridoxal phosphate (PLP)in its active form has all the following characteristics except:

Accepted Answer

A) It is covalently bonded to its enzyme. 
B) It possesses a phosphate group. 
C) It bonds to an amine group by means of the phosphate group. 
D) All of these characteristics are true. 
E) All of these characteristics are false. 
A) It is covalently bonded to its enzyme. 
B) It possesses a phosphate group. 
C) It bonds to an amine group by means of the phosphate group. 
D) All of these characteristics are true. 
E) All of these characteristics are false.

Question 19

By a simple transamination reaction,intermediates in the Citric Acid Cycle can be converted in one step to all of these amino acids,except:

Accepted Answer

A) Alanine 
B) Aspartic acid 
C) Glutamic acid 
D) Cysteine 
E) All of these amino acids are only one step away from the major metabolic pathways. 
A) Alanine 
B) Aspartic acid 
C) Glutamic acid 
D) Cysteine 
E) All of these amino acids are only one step away from the major metabolic pathways.

Question 20

What amino acid is the following a-keto acid derived from?  glutamic acid

Accepted Answer

The answer of What amino acid is the following a-keto...

Exam 20: Amino Acid Metabolism

Glucogenic amino acids include all of the following,except:

The two nitrogens in urea arise directly from:

What reaction does glutamate dehydrogenase (GDH)catalyze?

Draw the structure of the product formed when the substance shown below undergoes amide formation.

Amino acids biosynthesized from aspartate include all except:

Many biological reactions are endergonic.Explain how it is possible that these reactions occur spontaneously.

In the process of amino acid biosynthesis,how are glutamic acid,glutamine,proline,and arginine all related?

All of the following are true of transamination except:

The following shows a part of the biosynthetic pathway of amino acids.If possible,draw an arrow to match the amino acid with its precursor.

This many ATP equivalents are required to produce one molecule of urea from ammonia:

The appropriate sequence in the biosynthesis of proline from glutamate is:

Write a mechanism for the formation of a-iminoglutarate from glutamate employing NAD+ as the oxidizing coenzyme.

The key functional group in the PLP-dependent transamination of an a-amino acid is an activated

Write a mechanism for the nonenzymatic transformation of glutamate semialdehyde into 1-pyrroline-5-carboxylate.Which amino acid is synthesized from 1-pyrroline-5-carboxylate in vivo?

The term ketogenic amino acids refers to amino acids

The carbon skeletons of specific amino acids cannot be used to replenish which of the following species associated with the citric acid cycle?

The coenzyme pyridoxal phosphate (PLP)in its active form has all the following characteristics except:

By a simple transamination reaction,intermediates in the Citric Acid Cycle can be converted in one step to all of these amino acids,except:

What amino acid is the following a-keto acid derived from? glutamic acid

Structure and Bonding

Polar Covalent Bonds: Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols,phenols,and Thiols: Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Biomolecules: Amino Acids,peptides,and Proteins

Biomolecules: Carbohydrates

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

Filters

Write a mechanism for the formation of a-iminoglutarate from glutamate employing NAD⁺ as the oxidizing coenzyme.