Question 1

Formation of a peptide bond produces _____ as a byproduct.

Accepted Answer

A)  ammonia 
B)  carbon dioxide 
C)  water 
D)  H+ 
E)  OH- 
A)  ammonia 
B)  carbon dioxide 
C)  water 
D)  H+ 
E)  OH-

Question 2

What are prions?

Accepted Answer

Prions are proteins that can a

Question 3

In the ribonuclease experiments performed by Anfinsen,what was the significance of the presence of the reducing agent β-mercaptoethanol?

Accepted Answer

The reducing agent reduced inc

Question 4

What is the advantage of protein interaction and assembly with other proteins?

Accepted Answer

When proteins interact or assemble,new f

Question 5

_______________ is a fibrous protein and is the primary component of wool and hair.

Accepted Answer

The answer of _______________ is a fibrous protein and is...

Question 6

Which of the following is a function of proteins?

Accepted Answer

A)  energy carrying molecules 
B)  catalysts 
C)  storage of genetic information 
D)  None of the answers is correct. 
E)  All of the answers are correct. 
A)  energy carrying molecules 
B)  catalysts 
C)  storage of genetic information 
D)  None of the answers is correct. 
E)  All of the answers are correct.

Question 7

The term "quaternary" with respect to protein structure means

Accepted Answer

A)  a repeating structure stabilized by intrachain hydrogen bonds. 
B)  the ability to form all four kinds of noncovalent bonds. 
C)  a multisubunit structure. 
D)  a linear sequence of four amino acids. 
E)  None of the answers is correct. 
A)  a repeating structure stabilized by intrachain hydrogen bonds. 
B)  the ability to form all four kinds of noncovalent bonds. 
C)  a multisubunit structure. 
D)  a linear sequence of four amino acids. 
E)  None of the answers is correct.

Question 8

Which of the following pairs of amino acids is positively charged at a neutral pH?

Accepted Answer

A)  Lys, Arg 
B)  Tyr, Arg 
C)  Cys, Met 
D)  Leu, Pro 
E)  Asp, Glu 
A)  Lys, Arg 
B)  Tyr, Arg 
C)  Cys, Met 
D)  Leu, Pro 
E)  Asp, Glu

Question 9

In the following peptide,which amino acid is the N-terminus?Phe-Ala-Gly-Arg

Accepted Answer

A)  Phe 
B)  Ala 
C)  Gly 
D)  Arg 
E)  Phe and Arg 
A)  Phe 
B)  Ala 
C)  Gly 
D)  Arg 
E)  Phe and Arg

Question 10

How does the protein backbone add to structural stability?

Accepted Answer

The protein backbone contains the peptid

Question 11

Which individual won a Nobel Prize for his (her)landmark work in sequencing the protein insulin?

Accepted Answer

A)  Pauling 
B)  McClintock 
C)  Gilbert 
D)  Maxam 
E)  Sanger 
A)  Pauling 
B)  McClintock 
C)  Gilbert 
D)  Maxam 
E)  Sanger

Question 12

What are some of the modifications that proteins acquire?

Accepted Answer

A)  cleavage and trimming of the protein 
B)  addition of carbohydrate groups 
C)  phosphorylation of certain groups 
D)  All of these are modifications proteins acquire. 
E)  addition of carbohydrate groups and phosphorylation of certain groups 
A)  cleavage and trimming of the protein 
B)  addition of carbohydrate groups 
C)  phosphorylation of certain groups 
D)  All of these are modifications proteins acquire. 
E)  addition of carbohydrate groups and phosphorylation of certain groups

Question 13

Describe some of the features of an α helix.

Accepted Answer

The α helix is a coil stabilized by intr

Question 14

What is the advantage of having 20 different amino acids available to form proteins?

Accepted Answer

The amino acids provide a rich diversity

Question 15

The overall three-dimensional structure of a single polypeptide is referred to as _____.

Accepted Answer

A)  primary structure 
B)  secondary structure 
C)  tertiary structure 
D)  quaternary structure 
E)  both secondary structure and tertiary structure 
A)  primary structure 
B)  secondary structure 
C)  tertiary structure 
D)  quaternary structure 
E)  both secondary structure and tertiary structure

Question 16

Where are Ω and β turns and loops often found?

Accepted Answer

A)  in a hydrophobic pocket 
B)  on the interior cleft 
C)  at the protein interface with ligand 
D)  on the surface of proteins 
E)  None of the answers is correct. 
A)  in a hydrophobic pocket 
B)  on the interior cleft 
C)  at the protein interface with ligand 
D)  on the surface of proteins 
E)  None of the answers is correct.

Question 17

Which of the following amino acid residues would most likely be buried in the interior of a water-soluble,globular protein?

Accepted Answer

A)  Asp 
B)  Ser 
C)  Phe 
D)  Lys 
E)  Gln 
A)  Asp 
B)  Ser 
C)  Phe 
D)  Lys 
E)  Gln

Question 18

Every third residue in the protein collagen is ____________________.

Accepted Answer

The answer of Every third residue in the protein collagen...

Question 19

Which of the following is most often found in proteins?

Accepted Answer

A)  D-amino acids 
B)  L-amino acids 
C)  an equal amount of D- and L-amino acids 
D)  amino acids with the $\alpha$-carbon exclusively having an R absolute configuration 
E)  amino acids with the $\alpha$-carbon exclusively having an S absolute configuration 
A)  D-amino acids 
B)  L-amino acids 
C)  an equal amount of D- and L-amino acids 
D)  amino acids with the $\alpha$-carbon exclusively having an R absolute configuration 
E)  amino acids with the $\alpha$-carbon exclusively having an S absolute configuration

Question 20

What is the approximate mass of a protein containing 200 amino acids? (Assume there are no other protein modifications.)

Accepted Answer

A)  2,000 
B)  11,000 
C)  22,000 
D)  222,000 
E)  None of the answers is correct. 
A)  2,000 
B)  11,000 
C)  22,000 
D)  222,000 
E)  None of the answers is correct.

Exam 2: Protein Composition and Structure

Formation of a peptide bond produces _____ as a byproduct.

What are prions?

In the ribonuclease experiments performed by Anfinsen,what was the significance of the presence of the reducing agent β-mercaptoethanol?

What is the advantage of protein interaction and assembly with other proteins?

_______________ is a fibrous protein and is the primary component of wool and hair.

Which of the following is a function of proteins?

The term "quaternary" with respect to protein structure means

Which of the following pairs of amino acids is positively charged at a neutral pH?

In the following peptide,which amino acid is the N-terminus?Phe-Ala-Gly-Arg

How does the protein backbone add to structural stability?

Which individual won a Nobel Prize for his (her)landmark work in sequencing the protein insulin?

What are some of the modifications that proteins acquire?

Describe some of the features of an α helix.

What is the advantage of having 20 different amino acids available to form proteins?

The overall three-dimensional structure of a single polypeptide is referred to as _____.

Where are Ω and β turns and loops often found?

Which of the following amino acid residues would most likely be buried in the interior of a water-soluble,globular protein?

Every third residue in the protein collagen is ____________________.

Which of the following is most often found in proteins?

What is the approximate mass of a protein containing 200 amino acids? (Assume there are no other protein modifications.)

Biochemistry: An Evolving Science

Exploring Proteins and Proteomes

DNA, RNA, and the Flow of Genetic Information

Exploring Genes and Genomes

Exploring Evolution and Bioinformatics

Hemoglobin: a Portrait of a Protein in Action

Enzymes: Basic Concepts and Kinetics

Catalytic Strategies

Regulatory Strategies

Carbohydrates

Lipids and Cell Membranes

Membrane Channels and Pumps

Signal-Transduction Pathways

Metabolism: Basic Concepts and Design

Glycolysis and Gluconeogenesis

The Citric Acid Cycle

Oxidative Phosphorylation

The Light Reactions of Photosynthesis

The Calvin Cycle and the Pentose Phosphate Pathway

Glycogen Metabolism

Fatty Acid Metabolism

Protein Turnover and Amino Acid Catabolism

The Biosynthesis of Amino Acids

Nucleotide Biosynthesis

Biosynthesis of Membrane Lipids and Steroids

The Integration of Metabolism

DNA Replication, repair, and Recombination

RNA Synthesis and Processing

Protein Synthesis

The Control of Gene Expression in Prokaryotes

The Control of Gene Expression in Eukaryotes

Sensory Systems

The Immune System

Molecular Motors

Drug Development

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