Question 1

Which amino acid contains an aromatic ring in its side chain?

Accepted Answer

A) alanine 
B) glycine 
C) isoleucine 
D) tyrosine 
E) threonine 
A) alanine 
B) glycine 
C) isoleucine 
D) tyrosine 
E) threonine

Question 2

Consider the following forms of the amino acid alanine (Ala).Which statement concerning these structures is FALSE?

Accepted Answer

A) Structure I represents the form of Ala present in the blood at physiological pH. 
B) Structure II represents the form of Ala present in the basic environment of the intestines. 
C) Structure III represents the form of Ala present in the acidic environment of the stomach. 
D) Structure IV represents the zwitterion of Ala. 
E) None of the statements are false. 
A) Structure I represents the form of Ala present in the blood at physiological pH. 
B) Structure II represents the form of Ala present in the basic environment of the intestines. 
C) Structure III represents the form of Ala present in the acidic environment of the stomach. 
D) Structure IV represents the zwitterion of Ala. 
E) None of the statements are false.

Question 3

Which of the following kinds of proteins are biochemical catalysts?

Accepted Answer

A) nutrient proteins 
B) hormones 
C) transport proteins 
D) enzymes 
E) antigens 
A) nutrient proteins 
B) hormones 
C) transport proteins 
D) enzymes 
E) antigens

Question 4

Which hydrophobic amino acid contains a sulfur atom in its side chain?

Accepted Answer

A) alanine 
B) valine 
C) phenylalanine 
D) proline 
E) methionine 
A) alanine 
B) valine 
C) phenylalanine 
D) proline 
E) methionine

Question 5

In the α-helical structure of proteins, how many amino acid residues are there in one complete full turn of the helix?

Accepted Answer

A) 2 
B) 3.6 
C) 4 
D) 6 
E) greater than 10 
A) 2 
B) 3.6 
C) 4 
D) 6 
E) greater than 10

Question 6

Denaturation of a protein results in the loss of its native conformation and its biological activity.Which of the following best describes what happens when a protein is denatured?

Accepted Answer

A) The primary structure of the protein is altered. 
B) Peptide bonds are broken, and individual amino acids are released. 
C) Secondary, tertiary, or quaternary levels of structure are disrupted. 
D) The N-terminal and C-terminal ends of the protein form their zwitterions. 
E) The N-terminal and C-terminal ends of the protein are hydrolyzed. 
A) The primary structure of the protein is altered. 
B) Peptide bonds are broken, and individual amino acids are released. 
C) Secondary, tertiary, or quaternary levels of structure are disrupted. 
D) The N-terminal and C-terminal ends of the protein form their zwitterions. 
E) The N-terminal and C-terminal ends of the protein are hydrolyzed.

Question 7

Proteins are long chains of amino acids joined together by peptide bonds.Which of the following properly depicts the peptide bond formed between two generic amino acids?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 8

Glycoproteins are often found as receptors on the surface of cells.

Accepted Answer

A) True 
 B)False

Question 9

Which amino acid has a methyl group as its R group?

Accepted Answer

A) glycine 
B) alanine 
C) lysine 
D) valine 
E) tyrosine 
A) glycine 
B) alanine 
C) lysine 
D) valine 
E) tyrosine

Question 10

What is meant by the "quaternary structure" of a protein?

Accepted Answer

A) It refers to the four atoms that make up the peptide bonds that join the amino acids together in the protein chain. 
B) It describes the unique sequence of four amino acids in the protein chain. 
C) It describes the four regular, repeating structures found in the protein chain. 
D) It describes the overall three dimensional shape of a protein. 
E) It describes the association of two or more polypeptide chains to form one functioning protein unit. 
A) It refers to the four atoms that make up the peptide bonds that join the amino acids together in the protein chain. 
B) It describes the unique sequence of four amino acids in the protein chain. 
C) It describes the four regular, repeating structures found in the protein chain. 
D) It describes the overall three dimensional shape of a protein. 
E) It describes the association of two or more polypeptide chains to form one functioning protein unit.

Question 11

What is meant by the "tertiary structure" of a protein?

Accepted Answer

A) It refers to the peptide bonds that join the amino acids together in the protein chain. 
B) It describes the unique sequence of amino acids in the protein chain. 
C) It describes the regular, repeating structures found in the protein chain. 
D) It describes the overall three dimensional shape of a protein. 
E) It describes the association of two or more polypeptide chains to form one functioning protein unit. 
A) It refers to the peptide bonds that join the amino acids together in the protein chain. 
B) It describes the unique sequence of amino acids in the protein chain. 
C) It describes the regular, repeating structures found in the protein chain. 
D) It describes the overall three dimensional shape of a protein. 
E) It describes the association of two or more polypeptide chains to form one functioning protein unit.

Question 12

Which of the following are proteins produced by the immune system in response to foreign substances in the body?

Accepted Answer

A) transferases 
B) immunoglobulins 
C) insulins 
D) albumins 
E) myoglobins 
A) transferases 
B) immunoglobulins 
C) insulins 
D) albumins 
E) myoglobins

Question 13

Which of the following pairs of elements are present in proteins, but not in most carbohydrates?

Accepted Answer

A) nitrogen and sulfur 
B) carbon and hydrogen 
C) carbon and oxygen 
D) sulfur and oxygen 
E) nitrogen and oxygen 
A) nitrogen and sulfur 
B) carbon and hydrogen 
C) carbon and oxygen 
D) sulfur and oxygen 
E) nitrogen and oxygen

Question 14

The formation of a peptide bond is best described as which of the following?

Accepted Answer

A) neutralization reaction 
B) dehydration reaction 
C) hydration reaction 
D) hydrogenation reaction 
E) oxidation reaction 
A) neutralization reaction 
B) dehydration reaction 
C) hydration reaction 
D) hydrogenation reaction 
E) oxidation reaction

Question 15

Blood proteins will become denatured when they develop an overall negative charge.This would be the result of which of the following?

Accepted Answer

A) a lowering of pH 
B) an increase in pH 
C) a lowering of the partial pressure of oxygen 
D) an increase in the partial pressure of oxygen 
E) poor circulation 
A) a lowering of pH 
B) an increase in pH 
C) a lowering of the partial pressure of oxygen 
D) an increase in the partial pressure of oxygen 
E) poor circulation

Question 16

What level of protein structure specifies the sequence of amino acids in the protein?

Accepted Answer

A) quaternary 
B) β-pleated sheet 
C) primary 
D) secondary 
E) tertiary 
A) quaternary 
B) β-pleated sheet 
C) primary 
D) secondary 
E) tertiary

Question 17

What term describes the type of β-pleated sheet in which both peptides are aligned from amino terminus to carboxy terminus?

Accepted Answer

A) antiparallel 
B) perpendicular 
C) parallel 
D) matched 
E) congruent 
A) antiparallel 
B) perpendicular 
C) parallel 
D) matched 
E) congruent

Question 18

Which of the statements concerning the peptide shown below is FALSE?

Accepted Answer

A) It is a tripeptide. 
B) Its primary structure is Gly-Pro-Ser. 
C) There are two peptide bonds. 
D) The carboxyl group of Pro is joined to the amino group of Ser. 
E) The peptide contains only hydrophobic amino acid residues. 
A) It is a tripeptide. 
B) Its primary structure is Gly-Pro-Ser. 
C) There are two peptide bonds. 
D) The carboxyl group of Pro is joined to the amino group of Ser. 
E) The peptide contains only hydrophobic amino acid residues.

Question 19

The amino acid 5-hydroxylysine is found in collagen.Which of the following represents the structure of this unusual amino acid?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) None of the structures represent 5-hydroxylysine. 
A) I 
B) II 
C) III 
D) IV 
E) None of the structures represent 5-hydroxylysine.

Question 20

Which of the following is a source of complete protein?

Accepted Answer

A) beans 
B) rice 
C) peanuts 
D) wheat 
E) chicken 
A) beans 
B) rice 
C) peanuts 
D) wheat 
E) chicken

Exam 18: Protein Structure and Function

Which amino acid contains an aromatic ring in its side chain?

Consider the following forms of the amino acid alanine (Ala).Which statement concerning these structures is FALSE?

Which of the following kinds of proteins are biochemical catalysts?

Which hydrophobic amino acid contains a sulfur atom in its side chain?

In the α-helical structure of proteins, how many amino acid residues are there in one complete full turn of the helix?

Denaturation of a protein results in the loss of its native conformation and its biological activity.Which of the following best describes what happens when a protein is denatured?

Proteins are long chains of amino acids joined together by peptide bonds.Which of the following properly depicts the peptide bond formed between two generic amino acids?

Glycoproteins are often found as receptors on the surface of cells.

Which amino acid has a methyl group as its R group?

What is meant by the "quaternary structure" of a protein?

What is meant by the "tertiary structure" of a protein?

Which of the following are proteins produced by the immune system in response to foreign substances in the body?

Which of the following pairs of elements are present in proteins, but not in most carbohydrates?

The formation of a peptide bond is best described as which of the following?

Blood proteins will become denatured when they develop an overall negative charge.This would be the result of which of the following?

What level of protein structure specifies the sequence of amino acids in the protein?

What term describes the type of β-pleated sheet in which both peptides are aligned from amino terminus to carboxy terminus?

Which of the statements concerning the peptide shown below is FALSE?

The amino acid 5-hydroxylysine is found in collagen.Which of the following represents the structure of this unusual amino acid?

Which of the following is a source of complete protein?

Chemistry:methods and Measurement

The Structure of the Atom and the Periodic Table

Structure and Properties of Ionic and Covalent Compounds

Calculations, Chemical Changes, and the Chemical Equation

States of Matter- Gases, Liquids, and Solids

Solutions

Energy, Rate and Equilibrium

Acids and Bases

The Nucleus, Radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry- the Saturated Hydrocarbons

The Unsaturated Hydrocarbons- Alkenes, Alkynes, and Aromatics

Alcohols, Phenols, Thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Lipids and Their Functions in Biochemical Systems

Enzymes

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

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