Question 1

Protein synthesis proceeds in which direction?

Accepted Answer

A)  from the C-terminus to the N-terminus 
B)  from the middle towards the two ends 
C)  from the N-terminus to the C-terminus 
D)  the direction varies from one protein to another 
A)  from the C-terminus to the N-terminus 
B)  from the middle towards the two ends 
C)  from the N-terminus to the C-terminus 
D)  the direction varies from one protein to another C

Question 2

Which of the following pairs of amino acids can form hydrogen bonds?

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 D

Question 3

Which of the following is true about zwitterions?

Accepted Answer

A)  They are positively charged. 
B)  They are negatively charged. 
C)  They are electrically neutral. 
D)  The charge depends on the zwitterion. 
A)  They are positively charged. 
B)  They are negatively charged. 
C)  They are electrically neutral. 
D)  The charge depends on the zwitterion. C

Question 4

Which of the following amino acids is easily dimerized?

Accepted Answer

A)  alanine 
B)  cysteine 
C)  glycine 
D)  methionine 
A)  alanine 
B)  cysteine 
C)  glycine 
D)  methionine

Question 5

Which of the following is present in fetal hemoglobin but not adult hemoglobin?

Accepted Answer

A)  α-chains 
B)  β-chains 
C)  γ-chains 
D)  none of these 
A)  α-chains 
B)  β-chains 
C)  γ-chains 
D)  none of these

Question 6

The substance shown below is called cisplatin and is used in the treatment of testicular cancer. [Pt(NH3)2Cl2]
Which of the following correctly describes this substance?

Accepted Answer

A)  Both Cl and NH3 are ligands. 
B)  The substance contains six coordinate covalent bonds. 
C)  Pt obeys the 18-electron rule. 
D)  All of the above are correct for this substance. 
A)  Both Cl and NH3 are ligands. 
B)  The substance contains six coordinate covalent bonds. 
C)  Pt obeys the 18-electron rule. 
D)  All of the above are correct for this substance.

Question 7

Which of the following could serve as a definition of a coordinate covalent bond?

Accepted Answer

A)  One electron is contributed by each the metal and the ligand. 
B)  The metal ion contributes both electrons to the bond. 
C)  The ligand contributes both electrons to the bond. 
D)  The metal ion loses two electrons to the ligand. 
A)  One electron is contributed by each the metal and the ligand. 
B)  The metal ion contributes both electrons to the bond. 
C)  The ligand contributes both electrons to the bond. 
D)  The metal ion loses two electrons to the ligand.

Question 8

Sickle cell anemia is the result of how many changes in each β-chain of normal hemoglobin?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 9

Which of the following amino acids is not found in collagen?

Accepted Answer

A)  glycine 
B)  hydroxyproline 
C)  proline 
D)  None, they are all found in collagen. 
A)  glycine 
B)  hydroxyproline 
C)  proline 
D)  None, they are all found in collagen.

Question 10

Which level of protein structure is not affected by denaturation?

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary

Question 11

How many amino acids have an amide side chain?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 12

In which of the following is the amino nitrogen also part of the side chain?

Accepted Answer

A)  cysteine 
B)  glycine 
C)  proline 
D)  tryptophan 
A)  cysteine 
B)  glycine 
C)  proline 
D)  tryptophan

Question 13

When naming a protein or polypeptide which of the following is true?

Accepted Answer

A)  The convention for proteins is different from that for polypeptides. 
B)  They are named from the C-terminus to the N-terminus. 
C)  They are named from the middle towards the two ends. 
D)  They are named from the N-terminus to the C-terminus. 
A)  The convention for proteins is different from that for polypeptides. 
B)  They are named from the C-terminus to the N-terminus. 
C)  They are named from the middle towards the two ends. 
D)  They are named from the N-terminus to the C-terminus.

Question 14

Which of the following is true of an amino acid at a pH below its isoelectric point?

Accepted Answer

A)  It will have a negative charge. 
B)  It will be electrically neutral. 
C)  It will have a positive charge. 
D)  We cannot predict its charge. 
A)  It will have a negative charge. 
B)  It will be electrically neutral. 
C)  It will have a positive charge. 
D)  We cannot predict its charge.

Question 15

How many tripeptides can be made using the 20 standard amino acids?

Accepted Answer

A)  60 
B)  400 
C)  6840 
D)  8000 
A)  60 
B)  400 
C)  6840 
D)  8000

Question 16

How many amino acids have acidic side chains?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 17

Which of the following amino acids will exist as a -2 ion at very high pH?

Accepted Answer

A)  arginine 
B)  glutamic acid 
C)  isoleucine 
D)  none of these 
A)  arginine 
B)  glutamic acid 
C)  isoleucine 
D)  none of these

Question 18

Which of the following is true of all α-amino acids?

Accepted Answer

A)  All α-amino acids are also D-amino acids. 
B)  All α-amino acids are also L-amino acids. 
C)  The amino group is attached to the carbon of the carboxyl group. 
D)  The amino group and the carbon of the carboxyl group are attached to the same carbon atom. 
A)  All α-amino acids are also D-amino acids. 
B)  All α-amino acids are also L-amino acids. 
C)  The amino group is attached to the carbon of the carboxyl group. 
D)  The amino group and the carbon of the carboxyl group are attached to the same carbon atom.

Question 19

Consider the following image.   What type of interaction is depicted by the dashed line?

Accepted Answer

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

Question 20

Neurotransmitters known as catecholamines are formed from which amino acid?

Accepted Answer

A)  cysteine 
B)  threonine 
C)  tyrosine 
D)  valine 
A)  cysteine 
B)  threonine 
C)  tyrosine 
D)  valine

Exam 22: Proteins

Protein synthesis proceeds in which direction?

Which of the following pairs of amino acids can form hydrogen bonds?

Which of the following is true about zwitterions?

Which of the following amino acids is easily dimerized?

Which of the following is present in fetal hemoglobin but not adult hemoglobin?

The substance shown below is called cisplatin and is used in the treatment of testicular cancer. [Pt(NH3)2Cl2] Which of the following correctly describes this substance?

Which of the following could serve as a definition of a coordinate covalent bond?

Sickle cell anemia is the result of how many changes in each β-chain of normal hemoglobin?

Which of the following amino acids is not found in collagen?

Which level of protein structure is not affected by denaturation?

How many amino acids have an amide side chain?

In which of the following is the amino nitrogen also part of the side chain?

When naming a protein or polypeptide which of the following is true?

Which of the following is true of an amino acid at a pH below its isoelectric point?

How many tripeptides can be made using the 20 standard amino acids?

How many amino acids have acidic side chains?

Which of the following amino acids will exist as a -2 ion at very high pH?

Which of the following is true of all α-amino acids?

Consider the following image. What type of interaction is depicted by the dashed line?

Neurotransmitters known as catecholamines are formed from which amino acid?

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The substance shown below is called cisplatin and is used in the treatment of testicular cancer. [Pt(NH₃)₂Cl₂] Which of the following correctly describes this substance?