Question 1

What is the three-letter abbreviation for the peptide valylarginylisoleucine?

Accepted Answer

A) Val─Arg─Ile 
B) Val─Agn─Leu 
C) Vln─Arg─Ile 
D) Val─Agn─Isl 
E) Vln─Arg─Leu 
A) Val─Arg─Ile 
B) Val─Agn─Leu 
C) Vln─Arg─Ile 
D) Val─Agn─Isl 
E) Vln─Arg─Leu

Question 2

Matching

-Glutathione is a tripeptide containing a central ______ residue.

Accepted Answer

A)  glutamate 
B)  uncharged 
C)  deprotonated 
D)  three 
E)  amino group
F) two
G) C-terminus
H) lysine
I) racemic mixture
J) cysteine
K) zero
L) protonated
M) isoleucine
N) tryptophan
O) phenylalanine
P) N-terminus 
A)  glutamate 
B)  uncharged 
C)  deprotonated 
D)  three 
E)  amino group
F) two
G) C-terminus
H) lysine
I) racemic mixture
J) cysteine
K) zero
L) protonated
M) isoleucine
N) tryptophan
O) phenylalanine
P) N-terminus

Question 3

Which of the following amino acids is the least abundant in proteins?

Accepted Answer

A) V 
B) W 
C) G 
D) F 
E) A 
A) V 
B) W 
C) G 
D) F 
E) A

Question 4

Which amino acid does not have a primary $\alpha$-amino group?

Accepted Answer

A) glutamine 
B) arginine 
C) lysine 
D) proline 
E) glutamate 
A) glutamine 
B) arginine 
C) lysine 
D) proline 
E) glutamate

Question 5

About half of the 20 amino acids are called essential because

Accepted Answer

A) they are essential for the synthesis of pyrimidines. 
B) they are essential for the synthesis of purines. 
C) they are essential for nitrogen metabolism. 
D) our bodies need them for protein synthesis. 
E) our bodies cannot synthesize them and therefore they need to be present in our diet. 
A) they are essential for the synthesis of pyrimidines. 
B) they are essential for the synthesis of purines. 
C) they are essential for nitrogen metabolism. 
D) our bodies need them for protein synthesis. 
E) our bodies cannot synthesize them and therefore they need to be present in our diet.

Question 6

Asx refers to

Accepted Answer

A) a negatively charged aspartic acid. 
B) a positively charged asparagine. 
C) a dipeptide containing both aspartic acid and asparagine. 
D) either aspartic acid or asparagine. 
E) an unnatural amino acid formed during acid hydrolysis of peptide bonds. 
A) a negatively charged aspartic acid. 
B) a positively charged asparagine. 
C) a dipeptide containing both aspartic acid and asparagine. 
D) either aspartic acid or asparagine. 
E) an unnatural amino acid formed during acid hydrolysis of peptide bonds.

Question 7

Matching

-In the tripeptide Trp─Val─Phe,the N-terminal residue is ______.

Accepted Answer

A)  glutamate 
B)  uncharged 
C)  deprotonated 
D)  three 
E)  amino group
F) two
G) C-terminus
H) lysine
I) racemic mixture
J) cysteine
K) zero
L) protonated
M) isoleucine
N) tryptophan
O) phenylalanine
P) N-terminus 
A)  glutamate 
B)  uncharged 
C)  deprotonated 
D)  three 
E)  amino group
F) two
G) C-terminus
H) lysine
I) racemic mixture
J) cysteine
K) zero
L) protonated
M) isoleucine
N) tryptophan
O) phenylalanine
P) N-terminus

Question 8

The pK1,pK2,and pKR for the amino acid cysteine are 1.9,10.7,and 8.4,respectively.At pH 5.0,cysteine would be charged predominantly as follows:

Accepted Answer

A) "$\alpha$-carboxylate 0,$\alpha$-amino 0,sulfhydryl 0,net charge 0" 
B) "$\alpha$-carboxylate +1,$\alpha$-amino −1,sulfhydryl −1,net charge −1" 
C) "$\alpha$-carboxylate −1,$\alpha$-amino +1,sulfhydryl +1,net charge +1" 
D) "$\alpha$-carboxylate −1,$\alpha$-amino +1,sulfhydryl 0,net charge 0" 
E) "$\alpha$-carboxylate +1,$\alpha$-amino −1,sulfhydryl 0,net charge 0" 
A) "$\alpha$-carboxylate 0,$\alpha$-amino 0,sulfhydryl 0,net charge 0" 
B) "$\alpha$-carboxylate +1,$\alpha$-amino −1,sulfhydryl −1,net charge −1" 
C) "$\alpha$-carboxylate −1,$\alpha$-amino +1,sulfhydryl +1,net charge +1" 
D) "$\alpha$-carboxylate −1,$\alpha$-amino +1,sulfhydryl 0,net charge 0" 
E) "$\alpha$-carboxylate +1,$\alpha$-amino −1,sulfhydryl 0,net charge 0"

What is the three-letter abbreviation for the peptide valylarginylisoleucine?

Matching -Glutathione is a tripeptide containing a central ______ residue.

Which of the following amino acids is the least abundant in proteins?

Which amino acid does not have a primary $\alpha$ -amino group?

About half of the 20 amino acids are called essential because

Asx refers to

Matching -In the tripeptide Trp─Val─Phe,the N-terminal residue is ______.

The pK₁,pK₂,and pK_R for the amino acid cysteine are 1.9,10.7,and 8.4,respectively.At pH 5.0,cysteine would be charged predominantly as follows:

Introduction to the Chemistry of Life

Water

Nucleotides, nucleic Acids, and Genetic Information

Proteins: Primary Structure

Proteins: Three-Dimensional Structure

Protein Function Part I: Myoglobin and Hemoglobin

Carbohydrates

Lipids and Biological Membranes

Membrane Transport

Enzyme Catalysis

Enzyme Kinetics, inhibition and Control

Biochemical Signaling

Introduction to Metabolism

Glucose Catabolism

Glycogen Metabolism and Gluconeogenesis

Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Mammalian Fuel Metabolism: Integration and Regulation

Nucleotide Metabolism

Nucleic Acid Structure

DNA Replication, repair and Recombination

Transcription and Rna Processing

Protein Synthesis

Regulation of Gene Expression

Filters

Exam 4: Amino Acids

What is the three-letter abbreviation for the peptide valylarginylisoleucine?

Matching -Glutathione is a tripeptide containing a central ______ residue.

Which of the following amino acids is the least abundant in proteins?

Which amino acid does not have a primary α\alphaα -amino group?

About half of the 20 amino acids are called essential because

Asx refers to

Matching -In the tripeptide Trp─Val─Phe,the N-terminal residue is ______.

The pK1,pK2,and pKR for the amino acid cysteine are 1.9,10.7,and 8.4,respectively.At pH 5.0,cysteine would be charged predominantly as follows:

Introduction to the Chemistry of Life

Water

Nucleotides, nucleic Acids, and Genetic Information

Proteins: Primary Structure

Proteins: Three-Dimensional Structure

Protein Function Part I: Myoglobin and Hemoglobin

Carbohydrates

Lipids and Biological Membranes

Membrane Transport

Enzyme Catalysis

Enzyme Kinetics, inhibition and Control

Biochemical Signaling

Introduction to Metabolism

Glucose Catabolism

Glycogen Metabolism and Gluconeogenesis

Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Mammalian Fuel Metabolism: Integration and Regulation

Nucleotide Metabolism

Nucleic Acid Structure

DNA Replication, repair and Recombination

Transcription and Rna Processing

Protein Synthesis

Regulation of Gene Expression

Filters

Which amino acid does not have a primary $\alpha$ -amino group?

The pK₁,pK₂,and pK_R for the amino acid cysteine are 1.9,10.7,and 8.4,respectively.At pH 5.0,cysteine would be charged predominantly as follows: