Question 1

Serine has a _____ side chain; valine has a _____ side chain.

Accepted Answer

1: polar
2

Question 2

At a pH above its pKa, the $\varepsilon$-amino group of lysine is _____.

Accepted Answer

A)  protonated and neutral 
B)  protonated and positively charged 
C)  deprotonated and neutral 
D)  deprotonated and negatively charged 
E)  none of the above 
A)  protonated and neutral 
B)  protonated and positively charged 
C)  deprotonated and neutral 
D)  deprotonated and negatively charged 
E)  none of the above

Question 3

The formation of a dipeptide from two amino acids requires _____.

Accepted Answer

A)  reduction of the $\alpha$-carboxyl group 
B)  protonation of the $\alpha$-amine group 
C)  interaction of the two side chains 
D)  loss of water 
E)  none of the above 
A)  reduction of the $\alpha$-carboxyl group 
B)  protonation of the $\alpha$-amine group 
C)  interaction of the two side chains 
D)  loss of water 
E)  none of the above

Question 4

The following is an example of _____.

Accepted Answer

A)  parallel $\alpha$ helix 
B)  parallel $\beta$ sheet 
C)  antiparallel $\alpha$ helix 
D)  antiparallel $\beta$ sheet 
E)  none of the above 
A)  parallel $\alpha$ helix 
B)  parallel $\beta$ sheet 
C)  antiparallel $\alpha$ helix 
D)  antiparallel $\beta$ sheet 
E)  none of the above

Question 5

Which of the 20 standard amino acids is optically inactive?

Accepted Answer

A)  Arg 
B)  Pro 
C)  Ile 
D)  Gly 
E)  Cys 
A)  Arg 
B)  Pro 
C)  Ile 
D)  Gly 
E)  Cys

Question 6

Which of the following best describes the peptide backbone in a $\alpha$ sheet?

Accepted Answer

A)  coiled 
B)  compacted 
C)  highly extended 
D)  rigid 
E)  none of the above 
A)  coiled 
B)  compacted 
C)  highly extended 
D)  rigid 
E)  none of the above

Question 7

Disulfide bonds form between two residues of which amino acid?

Accepted Answer

A)  Met 
B)  Ser 
C)  Asn 
D)  Thr 
E)  Cys 
A)  Met 
B)  Ser 
C)  Asn 
D)  Thr 
E)  Cys

Question 8

What level of protein structure is characterized by the amino acid sequence?

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  none of the above 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  none of the above

Question 9

Heme is considered a _____.

Accepted Answer

A)  catalyst 
B)  prosthetic group 
C)  coenzyme 
D)  cofactor 
E)  none of the above 
A)  catalyst 
B)  prosthetic group 
C)  coenzyme 
D)  cofactor 
E)  none of the above

Question 10

When a peptide bond forms, an _____ reacts with a carboxylate group.

Accepted Answer

A)  amide 
B)  amine 
C)  alcohol 
D)  ester 
E)  none of the above 
A)  amide 
B)  amine 
C)  alcohol 
D)  ester 
E)  none of the above

Question 11

At physiological pH, all amino acids have at least _____ charged groups.

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  cannot be determined 
A)  0 
B)  1 
C)  2 
D)  3 
E)  cannot be determined

Serine has a _ side chain; valine has a _ side chain.

At a pH above its pK_a, the $\varepsilon$ -amino group of lysine is _____.

The formation of a dipeptide from two amino acids requires _____.

The following is an example of _____.

Which of the 20 standard amino acids is optically inactive?

Which of the following best describes the peptide backbone in a $\alpha$ sheet?

Disulfide bonds form between two residues of which amino acid?

What level of protein structure is characterized by the amino acid sequence?

Heme is considered a _____.

When a peptide bond forms, an _____ reacts with a carboxylate group.

At physiological pH, all amino acids have at least _____ charged groups.

The Chemical Foundations of Biochemistry

Nucleic Acids

Proteins Iienzymes

Membranes and an Introduction to Signal Transduction

Carbohydrates I

The Common Catabolic Pathway

Carbohydrates II

Lipids I

Lipids II

Amine Metabolism

Metabolism Integration

Nucleotide Deoxynucleotide Metabolism

Dna Replication, Damage and Repair

Rna Synthesis

Protein

Control of Gene

Determination of Macromolecular Structure

Allosterism and Receptor-Ligand

Designer Proteins and Protein Folding

Biomolecule Purification

Bioinformatics and Omics

Signal

Protein Trafficking

Photosynthesis Nitrogen

Filters

Exam 3: Proteins I

Serine has a _____ side chain; valine has a _____ side chain.

At a pH above its pKa, the ε\varepsilonε -amino group of lysine is _____.

The formation of a dipeptide from two amino acids requires _____.

The following is an example of _____.

Which of the 20 standard amino acids is optically inactive?

Which of the following best describes the peptide backbone in a α\alphaα sheet?

Disulfide bonds form between two residues of which amino acid?

What level of protein structure is characterized by the amino acid sequence?

Heme is considered a _____.

When a peptide bond forms, an _____ reacts with a carboxylate group.

At physiological pH, all amino acids have at least _____ charged groups.

The Chemical Foundations of Biochemistry

Nucleic Acids

Proteins Iienzymes

Membranes and an Introduction to Signal Transduction

Carbohydrates I

The Common Catabolic Pathway

Carbohydrates II

Lipids I

Lipids II

Amine Metabolism

Metabolism Integration

Nucleotide Deoxynucleotide Metabolism

Dna Replication, Damage and Repair

Rna Synthesis

Protein

Control of Gene

Determination of Macromolecular Structure

Allosterism and Receptor-Ligand

Designer Proteins and Protein Folding

Biomolecule Purification

Bioinformatics and Omics

Signal

Protein Trafficking

Photosynthesis Nitrogen

Filters

Serine has a _ side chain; valine has a _ side chain.

At a pH above its pK_a, the $\varepsilon$ -amino group of lysine is _____.

Which of the following best describes the peptide backbone in a $\alpha$ sheet?