Question 1

______________________ is the major fibrous protein present in skin,bone,tendon,cartilage,and teeth.

Accepted Answer

Collagen

Question 2

Agents such as ______________________ and guanidinium chloride denature proteins by disrupting the noncovalent interactions.

Accepted Answer

urea

Question 3

What are the three aromatic amino acids?

Accepted Answer

phenylalanine,tyrosine,and tryptophan

Question 4

Why are all the theoretical combinations of phi and psi not possible?

Accepted Answer

Steric hindrances of

Question 5

Why is the peptide bond planar?

Accepted Answer

A)  Bulky side chains prevent free rotation around the bond. 
B)  It contains partial double-bond character, preventing rotation. 
C)  Hydrogen bonding between the NH and C=O groups limits movement. 
D)  All of the answers are correct. 
E)  None of the answers is correct. 
A)  Bulky side chains prevent free rotation around the bond. 
B)  It contains partial double-bond character, preventing rotation. 
C)  Hydrogen bonding between the NH and C=O groups limits movement. 
D)  All of the answers are correct. 
E)  None of the answers is correct.

Question 6

What is the advantage of having certain areas of partially correct folded regions?

Accepted Answer

If some regions interact prefe

Question 7

Disulfide bonds in proteins can be reduced to free sulfhydryl groups by reagents such as _____________________.

Accepted Answer

The answer of Disulfide bonds in proteins can be reduced...

Question 8

Which amino acid forms disulfide bonds?

Accepted Answer

A)  histidine 
B)  methionine 
C)  proline 
D)  serine 
E)  cysteine 
A)  histidine 
B)  methionine 
C)  proline 
D)  serine 
E)  cysteine

Question 9

What structure(s)did Pauling and Corey predict in 1951?

Accepted Answer

A)  α helix 
B)  β sheet 
C)  β turns 
D)  Pauling and Corey predicted all three of these structures. 
E)  α helix and β sheet 
A)  α helix 
B)  β sheet 
C)  β turns 
D)  Pauling and Corey predicted all three of these structures. 
E)  α helix and β sheet

Question 10

At a pH of 12,what is the charged group(s)present in glycine?

Accepted Answer

A)  -NH3+ 
B)  -COO- 
C)  -NH2+ 
D)  -NH3+ and -COO- 
E)  All the charged groups are present. 
A)  -NH3+ 
B)  -COO- 
C)  -NH2+ 
D)  -NH3+ and -COO- 
E)  All the charged groups are present.

Question 11

What level of protein structure is composed of $\alpha$ helices,$\beta$ sheets,and turns?

Accepted Answer

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

Question 12

Which amino acid side chains are capable of ionization?

Accepted Answer

The amino acids are

Question 13

Collagen contains _____________________,a modified amino acid.

Accepted Answer

The answer of Collagen contains _____________________,a modified amino acid....

Question 14

What is the "hydrophobic effect" as it relates to protein structure?

Accepted Answer

The three-dimensional structur

Question 15

A protein is considered to be __________________ when it is converted into a randomly coiled structure without its normal activity.

Accepted Answer

The answer of A protein is considered to be __________________...

Question 16

The configuration of most peptide bonds in a protein is _____.

Accepted Answer

A)  cis 
B)  circular 
C)  parallel 
D)  trans 
E)  perpendicular 
A)  cis 
B)  circular 
C)  parallel 
D)  trans 
E)  perpendicular

Question 17

Key properties of proteins include

Accepted Answer

A)  a wide range of functional groups. 
B)  an ability to possess either rigid or flexible structures as dictated by functional requirements. 
C)  the ability to interact with other proteins. 
D)  All of the answers are correct. 
E)  a wide range of functional groups and an ability to possess either rigid or flexible structures as dictated by functional requirements. 
A)  a wide range of functional groups. 
B)  an ability to possess either rigid or flexible structures as dictated by functional requirements. 
C)  the ability to interact with other proteins. 
D)  All of the answers are correct. 
E)  a wide range of functional groups and an ability to possess either rigid or flexible structures as dictated by functional requirements.

Question 18

What does the modification involving the attachment of acetyl groups to the amino termini of proteins do?

Accepted Answer

The acetylation of the amino t

Question 19

The ________________________ β-sheet structure occurs when the two strands are oriented in the same directions (N →
C).

Accepted Answer

The answer of The ________________________ β-sheet structure occurs when the...

Question 20

Which two amino acids contain a sulfur atom?

Accepted Answer

A)  serine and methionine 
B)  serine and threonine 
C)  methionine and threonine 
D)  cysteine and methionine 
E)  cysteine and threonine 
A)  serine and methionine 
B)  serine and threonine 
C)  methionine and threonine 
D)  cysteine and methionine 
E)  cysteine and threonine

Exam 2: Protein Composition and Structure

______________________ is the major fibrous protein present in skin,bone,tendon,cartilage,and teeth.

Agents such as ______________________ and guanidinium chloride denature proteins by disrupting the noncovalent interactions.

What are the three aromatic amino acids?

Why are all the theoretical combinations of phi and psi not possible?

Why is the peptide bond planar?

What is the advantage of having certain areas of partially correct folded regions?

Disulfide bonds in proteins can be reduced to free sulfhydryl groups by reagents such as _____________________.

Which amino acid forms disulfide bonds?

What structure(s)did Pauling and Corey predict in 1951?

At a pH of 12,what is the charged group(s)present in glycine?

What level of protein structure is composed of α\alphaα helices, β\betaβ sheets,and turns?

Which amino acid side chains are capable of ionization?

Collagen contains _____________________,a modified amino acid.

What is the "hydrophobic effect" as it relates to protein structure?

A protein is considered to be __________________ when it is converted into a randomly coiled structure without its normal activity.

The configuration of most peptide bonds in a protein is _____.

Key properties of proteins include

What does the modification involving the attachment of acetyl groups to the amino termini of proteins do?

The ________________________ β-sheet structure occurs when the two strands are oriented in the same directions (N → C).

Which two amino acids contain a sulfur atom?

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

Filters

What level of protein structure is composed of $\alpha$ helices, $\beta$ sheets,and turns?