Question 1

How are the two chains of insulin linked?

Accepted Answer

A)  by peptide bonds 
B)  by ester bonds 
C)  by hydrogen bonds 
D)  by disulfide bonds 
A)  by peptide bonds 
B)  by ester bonds 
C)  by hydrogen bonds 
D)  by disulfide bonds

Question 2

Which of the following amino acids plays a vital role in the interaction between the heme group and bound oxygen in hemoglobin?

Accepted Answer

A)  methionine 
B)  lysine 
C)  histidine 
D)  tryptophan 
A)  methionine 
B)  lysine 
C)  histidine 
D)  tryptophan

Question 3

How many polypeptide chains are present in hemoglobin?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 4

Which of the following are considered the most important biological compound?

Accepted Answer

A)  vitamins 
B)  carbohydrates 
C)  lipids 
D)  proteins 
A)  vitamins 
B)  carbohydrates 
C)  lipids 
D)  proteins

Question 5

Identify the protein whose complete tertiary structure was determined for the first time by X-ray crystallography.

Accepted Answer

A)  collagen 
B)  insulin 
C)  hemoglobin 
D)  myoglobin 
A)  collagen 
B)  insulin 
C)  hemoglobin 
D)  myoglobin

Question 6

Which of the following amino acids has the lowest pI?

Accepted Answer

A)  arginine 
B)  cysteine 
C)  glycine 
D)  glutamic acid 
A)  arginine 
B)  cysteine 
C)  glycine 
D)  glutamic acid

Question 7

Which of the following dipeptides is serylalanine?

Accepted Answer

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

Question 8

How many amino acid residues are present in both vasopressin and oxytocin?

Accepted Answer

A)  5 
B)  7 
C)  9 
D)  11 
A)  5 
B)  7 
C)  9 
D)  11

Question 9

Individuals with the genes for sickle cell anemia are resistant to which of the following diseases?

Accepted Answer

A)  flu 
B)  malaria 
C)  polio 
D)  sleeping sickness 
A)  flu 
B)  malaria 
C)  polio 
D)  sleeping sickness

Question 10

Which of the following is true of amino acids that are dissolved in water?

Accepted Answer

A)  They exist in an un-ionized form at high pH. 
B)  They exist in an un-ionized form at low pH. 
C)  They exist in an un-ionized form only at a specific pH. 
D)  They do not exist in an un-ionized form at any pH. 
A)  They exist in an un-ionized form at high pH. 
B)  They exist in an un-ionized form at low pH. 
C)  They exist in an un-ionized form only at a specific pH. 
D)  They do not exist in an un-ionized form at any pH.

Question 11

Which of the following is a type of secondary structure that is found in proteins?

Accepted Answer

A)  α-helix 
B)  β-pleated sheet 
C)  both α-helix and β-pleated sheet 
D)  neither α-helix nor β-pleated sheet 
A)  α-helix 
B)  β-pleated sheet 
C)  both α-helix and β-pleated sheet 
D)  neither α-helix nor β-pleated sheet

Question 12

Which of the following neurotransmitters is associated with manic-depressive schizophrenia?

Accepted Answer

A)  adrenaline 
B)  norepinephrine 
C)  serotonin 
D)  none of these 
A)  adrenaline 
B)  norepinephrine 
C)  serotonin 
D)  none of these

Question 13

Which of the following secondary structures is maintained by both intermolecular or intramolecular hydrogen bonds?

Accepted Answer

A)  α-helix 
B)  β-pleated sheet 
C)  a hairpin turn 
D)  all of these 
A)  α-helix 
B)  β-pleated sheet 
C)  a hairpin turn 
D)  all of these

Question 14

From which amino acid is tyrosine usually derived?

Accepted Answer

A)  cysteine 
B)  phenylalanine 
C)  tryptophan 
D)  valine 
A)  cysteine 
B)  phenylalanine 
C)  tryptophan 
D)  valine

Question 15

Why is 70% ethanol used to sterilize skin before injections instead of 95% ethanol?

Accepted Answer

A)  70% ethanol kills bacteria by denaturing their surface proteins. 
B)  70% ethanol penetrates bacteria and kills them by coagulating their proteins. 
C)  70% ethanol can kill bacteria without damaging their structures. 
D)  None of these are correct. 
A)  70% ethanol kills bacteria by denaturing their surface proteins. 
B)  70% ethanol penetrates bacteria and kills them by coagulating their proteins. 
C)  70% ethanol can kill bacteria without damaging their structures. 
D)  None of these are correct.

Question 16

Which of the following types of chemical reaction is involved in the conversion of dopamine to epinephrine?

Accepted Answer

A)  addition 
B)  reduction 
C)  decarboxylation 
D)  methylation 
A)  addition 
B)  reduction 
C)  decarboxylation 
D)  methylation

Question 17

How many different dipeptides can be made from 20 amino acids?

Accepted Answer

A)  20 
B)  40 
C)  200 
D)  400 
A)  20 
B)  40 
C)  200 
D)  400

Question 18

Which of the following chemical interactions is associated with the treatment of heavy metal poisoning?

Accepted Answer

A)  hydrogen bonding 
B)  covalent bonding 
C)  a hydrophobic interaction 
D)  salt bridges 
E)  a metal ion coordination 
A)  hydrogen bonding 
B)  covalent bonding 
C)  a hydrophobic interaction 
D)  salt bridges 
E)  a metal ion coordination

Question 19

Which of the following structures contains hemoglobin that is 100% saturated with oxygen?

Accepted Answer

A)  capillaries of active muscles 
B)  alveoli of the lungs 
C)  hepatocytes of the liver 
D)  cells of the intestinal tract 
A)  capillaries of active muscles 
B)  alveoli of the lungs 
C)  hepatocytes of the liver 
D)  cells of the intestinal tract

Question 20

Serotonin, a neurotransmitter, has a calming effect. Which of the following amino acids is the precursor of serotonin?

Accepted Answer

A)  arginine 
B)  glutamic acid 
C)  isoleucine 
D)  tryptophan 
A)  arginine 
B)  glutamic acid 
C)  isoleucine 
D)  tryptophan

Exam 21: Proteins

How are the two chains of insulin linked?

Which of the following amino acids plays a vital role in the interaction between the heme group and bound oxygen in hemoglobin?

How many polypeptide chains are present in hemoglobin?

Which of the following are considered the most important biological compound?

Identify the protein whose complete tertiary structure was determined for the first time by X-ray crystallography.

Which of the following amino acids has the lowest pI?

Which of the following dipeptides is serylalanine?

How many amino acid residues are present in both vasopressin and oxytocin?

Individuals with the genes for sickle cell anemia are resistant to which of the following diseases?

Which of the following is true of amino acids that are dissolved in water?

Which of the following is a type of secondary structure that is found in proteins?

Which of the following neurotransmitters is associated with manic-depressive schizophrenia?

Which of the following secondary structures is maintained by both intermolecular or intramolecular hydrogen bonds?

From which amino acid is tyrosine usually derived?

Why is 70% ethanol used to sterilize skin before injections instead of 95% ethanol?

Which of the following types of chemical reaction is involved in the conversion of dopamine to epinephrine?

How many different dipeptides can be made from 20 amino acids?

Which of the following chemical interactions is associated with the treatment of heavy metal poisoning?

Which of the following structures contains hemoglobin that is 100% saturated with oxygen?

Serotonin, a neurotransmitter, has a calming effect. Which of the following amino acids is the precursor of serotonin?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters