Question 1

Which of the following is alanylglycine?

Accepted Answer

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

Question 2

Which of the following is true of the atoms in the backbone unit of a protein?

Accepted Answer

A)  They all are in a straight line. 
B)  They are all in the same plane. 
C)  They all have tetrahedral geometry. 
D)  None of these is correct. 
A)  They all are in a straight line. 
B)  They are all in the same plane. 
C)  They all have tetrahedral geometry. 
D)  None of these is correct.

Question 3

Which of the following is a γ-hydroxy-α-amino acid?

Accepted Answer

A)  asparagine 
B)  serine 
C)  threonine 
D)  none of these 
A)  asparagine 
B)  serine 
C)  threonine 
D)  none of these

Question 4

Although all biological molecules are important, which type of molecule is considered the most important?

Accepted Answer

A)  amino acids 
B)  carbohydrates 
C)  lipids 
D)  proteins 
A)  amino acids 
B)  carbohydrates 
C)  lipids 
D)  proteins

Question 5

What is a residue?

Accepted Answer

A)  An amino acid which has been severed from a protein. 
B)  Any individual amino acid in a protein or polypeptide. 
C)  The portion of a protein which remains after one amino acid has been removed from the C-terminus. 
D)  The portion of a protein which remains after one amino acid has been removed from the N-terminus. 
A)  An amino acid which has been severed from a protein. 
B)  Any individual amino acid in a protein or polypeptide. 
C)  The portion of a protein which remains after one amino acid has been removed from the C-terminus. 
D)  The portion of a protein which remains after one amino acid has been removed from the N-terminus.

Question 6

Which of the following describes the atomic makeup of the backbone unit of a protein?

Accepted Answer

A)  2 carbon atoms, 2 nitrogen atoms, 2 oxygen atoms 
B)  3 carbon atoms, 2 nitrogen atoms, 2 oxygen atoms, 1 hydrogen atom 
C)  3 carbon atoms, 1 nitrogen atom, 1 oxygen atom, 1 hydrogen atom 
D)  3 carbon atoms, 2 nitrogen atoms, 2 oxygen atoms, 2 hydrogen atoms 
A)  2 carbon atoms, 2 nitrogen atoms, 2 oxygen atoms 
B)  3 carbon atoms, 2 nitrogen atoms, 2 oxygen atoms, 1 hydrogen atom 
C)  3 carbon atoms, 1 nitrogen atom, 1 oxygen atom, 1 hydrogen atom 
D)  3 carbon atoms, 2 nitrogen atoms, 2 oxygen atoms, 2 hydrogen atoms

Question 7

When will a protein have a net positive charge?

Accepted Answer

A)  always 
B)  never 
C)  when the pH is above its isoelectric point 
D)  when the pH is below its isoelectric point 
A)  always 
B)  never 
C)  when the pH is above its isoelectric point 
D)  when the pH is below its isoelectric point

Question 8

Which of the following amino acids absorbs UV radiation at 280 nm?

Accepted Answer

A)  arginine 
B)  alanine 
C)  leucine 
D)  tyrosine 
A)  arginine 
B)  alanine 
C)  leucine 
D)  tyrosine

Question 9

What is the most important property of the R groups of the amino acids?

Accepted Answer

A)  their polarity 
B)  their shape 
C)  their size 
D)  none of these 
A)  their polarity 
B)  their shape 
C)  their size 
D)  none of these

Question 10

When will a protein have a net negative charge?

Accepted Answer

A)  always 
B)  never 
C)  when the pH is above its isoelectric point 
D)  when the pH is below its isoelectric point 
A)  always 
B)  never 
C)  when the pH is above its isoelectric point 
D)  when the pH is below its isoelectric point

Question 11

When will a protein have the lowest solubility?

Accepted Answer

A)  when the pH is very low 
B)  when the pH = 7 
C)  when the pH is very high 
D)  at its isoelectric point 
A)  when the pH is very low 
B)  when the pH = 7 
C)  when the pH is very high 
D)  at its isoelectric point

Question 12

Which of the following pairs of amino acids can form a salt bridge?

Accepted Answer

A)  alanine and glutamic acid 
B)  aspartic acid and lysine 
C)  leucine and phenylalanine 
D)  serine and tyrosine 
A)  alanine and glutamic acid 
B)  aspartic acid and lysine 
C)  leucine and phenylalanine 
D)  serine and tyrosine

Question 13

The substance shown below is the Fe-protoporphorin IX found in heme which is involved in oxygen transport in the blood.   Which of the following correctly describes this substance?

Accepted Answer

A)  There are four coordinate covalent bonds in the structure. 
B)  Fe(II) has six d electrons. 
C)  Fe obeys the 18-electron rule. 
D)  All of the above are correct for this substance. 
A)  There are four coordinate covalent bonds in the structure. 
B)  Fe(II) has six d electrons. 
C)  Fe obeys the 18-electron rule. 
D)  All of the above are correct for this substance.

Question 14

Approximately how many different proteins are found in a typical cell?

Accepted Answer

A)  900 
B)  9000 
C)  100,000 
D)  1,000,000 
A)  900 
B)  9000 
C)  100,000 
D)  1,000,000

Question 15

Which protein contains hydroxylysine and hydroxyproline?

Accepted Answer

A)  actin 
B)  collagen 
C)  fibrinogen 
D)  hemoglobin 
A)  actin 
B)  collagen 
C)  fibrinogen 
D)  hemoglobin

Question 16

Which of the following amino acids is only occasionally found in proteins?

Accepted Answer

A)  asparagine 
B)  hydroxyproline 
C)  proline 
D)  serine 
A)  asparagine 
B)  hydroxyproline 
C)  proline 
D)  serine

Question 17

What type of chemical reaction is involved in the formation of disulfide bonds from thiols?

Accepted Answer

A)  addition 
B)  reduction 
C)  oxidation 
D)  substitution 
A)  addition 
B)  reduction 
C)  oxidation 
D)  substitution

Question 18

Which of the following is a structural protein?

Accepted Answer

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

Question 19

Which of the following correctly describes the relationship between the primary structure of a protein and protein function?

Accepted Answer

A)  Changing one amino acid always affects protein function. 
B)  Changing one amino acid may or may not affect protein function. 
C)  Changing one amino acid never affects protein function. 
D)  There is no relationship between primary structure and protein function. 
A)  Changing one amino acid always affects protein function. 
B)  Changing one amino acid may or may not affect protein function. 
C)  Changing one amino acid never affects protein function. 
D)  There is no relationship between primary structure and protein function.

Question 20

Which of the following is alanylserine?

Accepted Answer

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

Exam 22: Proteins

Which of the following is alanylglycine?

Which of the following is true of the atoms in the backbone unit of a protein?

Which of the following is a γ-hydroxy-α-amino acid?

Although all biological molecules are important, which type of molecule is considered the most important?

What is a residue?

Which of the following describes the atomic makeup of the backbone unit of a protein?

When will a protein have a net positive charge?

Which of the following amino acids absorbs UV radiation at 280 nm?

What is the most important property of the R groups of the amino acids?

When will a protein have a net negative charge?

When will a protein have the lowest solubility?

Which of the following pairs of amino acids can form a salt bridge?

The substance shown below is the Fe-protoporphorin IX found in heme which is involved in oxygen transport in the blood. Which of the following correctly describes this substance?

Approximately how many different proteins are found in a typical cell?

Which protein contains hydroxylysine and hydroxyproline?

Which of the following amino acids is only occasionally found in proteins?

What type of chemical reaction is involved in the formation of disulfide bonds from thiols?

Which of the following is a structural protein?

Which of the following correctly describes the relationship between the primary structure of a protein and protein function?

Which of the following is alanylserine?

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Chirality: the Handedness of Molecules

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