Question 1

Which of the following could contribute to quaternary structure?

Accepted Answer

A) charge-charge interaction between arginine and glutamic acid 
B) disulfide bond 
C) hydrogen bond between threonine hydroxyl group and imidazole ring of histidine 
D) hydrophobic interaction between phenylalanine and tryptophan 
E) all of the above 
A) charge-charge interaction between arginine and glutamic acid 
B) disulfide bond 
C) hydrogen bond between threonine hydroxyl group and imidazole ring of histidine 
D) hydrophobic interaction between phenylalanine and tryptophan 
E) all of the above

Question 2

Which of the following structural proteins is correctly paired with the modified amino acid or cross-link that is an integral part of that protein?

Accepted Answer

A) collagen: 5-hydroxylysine 
B) elastin: hydroxyproline 
C) $\alpha$-keratin: cross link formed by oxidation of lysine, then aldol condensation 
D) collagen: desmosine 
E) fibroin: cross-link formed by dehydration of serine residues 
A) collagen: 5-hydroxylysine 
B) elastin: hydroxyproline 
C) $\alpha$-keratin: cross link formed by oxidation of lysine, then aldol condensation 
D) collagen: desmosine 
E) fibroin: cross-link formed by dehydration of serine residues

Question 3

Which amino acid is often referred to as a "helix-breaker" due to its absence from $\alpha$-helices but is often found in structures such as $\beta$-turns?

Accepted Answer

A) Val 
B) Met 
C) Pro 
D) Phe 
E) Leu 
A) Val 
B) Met 
C) Pro 
D) Phe 
E) Leu

Question 4

Draw a section of antiparallel $\beta$-sheet showing two sheets with three residues in each sheet. Clearly show the hydrogen bond pattern between the two sheets.

Accepted Answer

The answer of Draw a section of antiparallel $\beta$-sheet showing...

Which of the following could contribute to quaternary structure?

Which of the following structural proteins is correctly paired with the modified amino acid or cross-link that is an integral part of that protein?

Which amino acid is often referred to as a "helix-breaker" due to its absence from $\alpha$ -helices but is often found in structures such as $\beta$ -turns?

Draw a section of antiparallel $\beta$ -sheet showing two sheets with three residues in each sheet. Clearly show the hydrogen bond pattern between the two sheets.

The Scope of Biochemistry

The Matrix of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

Protein Function and Evolution

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, Gluconeogenesis, Glycogen Metabolism, and the Pentose Phosphate Pathway

Citric Acid Cycle and Glyoxylate Cycle

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism I: Fatty Acids, Triacylglycerols, and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, Steroids, Isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, Utilization, and Turnover

Metabolism of Nitogenous Compounds II: Amino Acids, Porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes and Chromosomes

DNA Replication

DNA Restructuring: Repair, Recombination, Rearrangement, Amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

Filters

Exam 6: The Three-Dimensional Structure of Proteins

Which of the following could contribute to quaternary structure?

Which of the following structural proteins is correctly paired with the modified amino acid or cross-link that is an integral part of that protein?

Which amino acid is often referred to as a "helix-breaker" due to its absence from α\alphaα -helices but is often found in structures such as β\betaβ -turns?

Draw a section of antiparallel β\betaβ -sheet showing two sheets with three residues in each sheet. Clearly show the hydrogen bond pattern between the two sheets.

The Scope of Biochemistry

The Matrix of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

Protein Function and Evolution

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, Gluconeogenesis, Glycogen Metabolism, and the Pentose Phosphate Pathway

Citric Acid Cycle and Glyoxylate Cycle

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism I: Fatty Acids, Triacylglycerols, and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, Steroids, Isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, Utilization, and Turnover

Metabolism of Nitogenous Compounds II: Amino Acids, Porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes and Chromosomes

DNA Replication

DNA Restructuring: Repair, Recombination, Rearrangement, Amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

Filters

Which amino acid is often referred to as a "helix-breaker" due to its absence from $\alpha$ -helices but is often found in structures such as $\beta$ -turns?

Draw a section of antiparallel $\beta$ -sheet showing two sheets with three residues in each sheet. Clearly show the hydrogen bond pattern between the two sheets.