Question 1

Provide the structure of the amino acid produced from the following reaction sequence.

Accepted Answer

The answer of Provide the structure of the amino acid...

Question 2

When more than fifty amino acids are connected to each other, they form _________.

Accepted Answer

A)  a tripeptide 
B)  a protein 
C)  a polypeptide 
D)  a tetrapeptide 
E)  none of these 
A)  a tripeptide 
B)  a protein 
C)  a polypeptide 
D)  a tetrapeptide 
E)  none of these

Question 3

$\alpha$-Keratin found in hair, nails, and feathers is classified as ______.

Accepted Answer

A)  globular protein 
B)  fibrous protein 
C)  structural protein 
D)  B and C 
E)  none of these 
A)  globular protein 
B)  fibrous protein 
C)  structural protein 
D)  B and C 
E)  none of these

Question 4

Which of the following amino acids is not an essential amino acid?

Accepted Answer

A)  phenylalanine 
B)  glycine 
C)  isoleucine 
D)  threonine 
E)  valine 
A)  phenylalanine 
B)  glycine 
C)  isoleucine 
D)  threonine 
E)  valine

Question 5

Which of the following amino acids is the largest amino acid with a nonpolar side chain?

Accepted Answer

A)  tyrosine 
B)  proline 
C)  leucine 
D)  tryptophan 
E)  glycine 
A)  tyrosine 
B)  proline 
C)  leucine 
D)  tryptophan 
E)  glycine

Question 6

Which of the following dipeptides is/are formed when alanine and valine are reacted in the presence of dicyclohexylcarbodiimide (DCC)?

Accepted Answer

A)  Ala-Val 
B)  Val-Ala 
C)  Ala-Ala 
D)  Val-Val 
E)  all of these 
A)  Ala-Val 
B)  Val-Ala 
C)  Ala-Ala 
D)  Val-Val 
E)  all of these

Question 7

Which of the following is a correct structure for L-valine?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 8

Which of the following naturally occurring amino acids does not have the S configuration?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 9

Which one of the following amino acid does not have an L-isomer?

Accepted Answer

A)  valine 
B)  alanine 
C)  leucine 
D)  glycine 
E)  none of these 
A)  valine 
B)  alanine 
C)  leucine 
D)  glycine 
E)  none of these

Question 10

Provide the reagents necessary to synthesize the following amino acid via the amidomalonate synthesis.

Accepted Answer

The answer of Provide the reagents necessary to synthesize the...

Question 11

Draw a bond-line structure for the tetrapeptide Ala-Ser-Cys-Phe.

Accepted Answer

The answer of Draw a bond-line structure for the tetrapeptide...

Question 12

In a quaternary structure, the nonpolar groups are attracted to each other with _________________.

Accepted Answer

A)  hydrogen bonding 
B)  van der Waals interactions 
C)  ion-dipole interactions 
D)  dipole-dipole interactions 
E)  covalent bonding 
A)  hydrogen bonding 
B)  van der Waals interactions 
C)  ion-dipole interactions 
D)  dipole-dipole interactions 
E)  covalent bonding

Question 13

What is the pI of the following amino acid?

Accepted Answer

A)  2.76 
B)  5.74 
C)  6.62 
D)  7.50 
E)  none of these 
A)  2.76 
B)  5.74 
C)  6.62 
D)  7.50 
E)  none of these

Question 14

Provide the steps necessary to prepare the tetrapeptide Thr-Val-Ile-Met using the Merrifield synthesis.

Accepted Answer

@#IMG-DLM&_TB4454_00

Question 15

_______________ is a condition where the hemoglobin is distorted.

Accepted Answer

The answer of _______________ is a condition where the hemoglobin...

Question 16

Which of the following is the predominant form of asparagine at physiological pH?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 17

Which of the following is a secondary structure of fibroin found in spider web and silk?

Accepted Answer

A)  ($\beta$-pleated sheets) 
B)  ($\alpha$-pleated sheets) 
C)  ($\alpha$-helix) 
D)  ($\beta$-helix) 
E)  none of these 
A)  ($\beta$-pleated sheets) 
B)  ($\alpha$-pleated sheets) 
C)  ($\alpha$-helix) 
D)  ($\beta$-helix) 
E)  none of these

Question 18

Which of the following amino acids will migrate towards the anode at pH 6?
Phenylalanine: pI = 5.5
Leucine: pI = 6

Accepted Answer

The answer of Which of the following amino acids will...

Question 19

Which of the following aldehydes would produce glycine using a Strecker synthesis?

Accepted Answer

A)  methanal 
B)  ethanal 
C)  propanal 
D)  butanal 
A)  methanal 
B)  ethanal 
C)  propanal 
D)  butanal

Question 20

The ______ of amino acids in a protein is referred to as its primary structure.

Accepted Answer

A)  twisting 
B)  sequence 
C)  folding 
D)  bonding 
E)  reacting 
A)  twisting 
B)  sequence 
C)  folding 
D)  bonding 
E)  reacting

Exam 25: Amino Acids, Peptides, and Proteins

Provide the structure of the amino acid produced from the following reaction sequence.

When more than fifty amino acids are connected to each other, they form _________.

α\alphaα -Keratin found in hair, nails, and feathers is classified as ______.

Which of the following amino acids is not an essential amino acid?

Which of the following amino acids is the largest amino acid with a nonpolar side chain?

Which of the following dipeptides is/are formed when alanine and valine are reacted in the presence of dicyclohexylcarbodiimide (DCC)?

Which of the following is a correct structure for L-valine?

Which of the following naturally occurring amino acids does not have the S configuration?

Which one of the following amino acid does not have an L-isomer?

Provide the reagents necessary to synthesize the following amino acid via the amidomalonate synthesis.

Draw a bond-line structure for the tetrapeptide Ala-Ser-Cys-Phe.

In a quaternary structure, the nonpolar groups are attracted to each other with _________________.

What is the pI of the following amino acid?

Provide the steps necessary to prepare the tetrapeptide Thr-Val-Ile-Met using the Merrifield synthesis.

_______________ is a condition where the hemoglobin is distorted.

Which of the following is the predominant form of asparagine at physiological pH?

Which of the following is a secondary structure of fibroin found in spider web and silk?

Which of the following amino acids will migrate towards the anode at pH 6? Phenylalanine: pI = 5.5 Leucine: pI = 6

Which of the following aldehydes would produce glycine using a Strecker synthesis?

The ______ of amino acids in a protein is referred to as its primary structure.

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Lipids

Synthetic Polymers

Filters

$\alpha$ -Keratin found in hair, nails, and feathers is classified as ______.