Question 1

What do the amino acids Tyr,Asn,and Thr have in common?

Accepted Answer

A)  aromatic rings 
B)  negatively charged at pH 7.0 
C)  positively charged at pH 7.0 
D)  double bonds in side chains 
E)  polar 
A)  aromatic rings 
B)  negatively charged at pH 7.0 
C)  positively charged at pH 7.0 
D)  double bonds in side chains 
E)  polar

Question 2

_____________________________ refers to the spatial arrangement of subunits and the nature of their interactions.

Accepted Answer

Quaternary

Question 3

$\alpha$-Keratin is referred to as a coiled-coil protein.Describe the protein structure of $\alpha$-keratin.

Accepted Answer

Two ? helices entwin

Question 4

A term that describes a molecule that contains both positive and negative charges but overall has a neutral charge is _____.

Accepted Answer

A)  enantiomer 
B)  amino acid 
C)  racemate 
D)  zwitterion 
E)  amphipath 
A)  enantiomer 
B)  amino acid 
C)  racemate 
D)  zwitterion 
E)  amphipath

Question 5

Which of the following amino acids has an ionizable R-group with a pKa near neutral pH?

Accepted Answer

A)  histidine 
B)  serine 
C)  aspartic acid 
D)  lysine 
E)  tyrosine 
A)  histidine 
B)  serine 
C)  aspartic acid 
D)  lysine 
E)  tyrosine

Question 6

How does a protein's amino acid sequence influence the tertiary structure?

Accepted Answer

A PROTEIN WILL SPONTANEOUSLY F

Question 7

What type of plot allows one to investigate the likely phi and psi angles of the peptide backbone?

Accepted Answer

A)  Hill 
B)  Lineweaver-Burk 
C)  Hanes-Woolf 
D)  Ramachandran 
E)  Michaelis-Menten 
A)  Hill 
B)  Lineweaver-Burk 
C)  Hanes-Woolf 
D)  Ramachandran 
E)  Michaelis-Menten

Question 8

What is the charged group(s)present in glycine at a pH of 7?

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.

Exam 2: Protein Composition and Structure

What do the amino acids Tyr,Asn,and Thr have in common?

_____________________________ refers to the spatial arrangement of subunits and the nature of their interactions.

α\alphaα -Keratin is referred to as a coiled-coil protein.Describe the protein structure of α\alphaα -keratin.

A term that describes a molecule that contains both positive and negative charges but overall has a neutral charge is _____.

Which of the following amino acids has an ionizable R-group with a pKa near neutral pH?

How does a protein's amino acid sequence influence the tertiary structure?

What type of plot allows one to investigate the likely phi and psi angles of the peptide backbone?

What is the charged group(s)present in glycine at a pH of 7?

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

$\alpha$ -Keratin is referred to as a coiled-coil protein.Describe the protein structure of $\alpha$ -keratin.

Which of the following amino acids has an ionizable R-group with a pK_a near neutral pH?