Question 1

In which of the following do both amino acids have a nonpolar side chain?

Accepted Answer

A)   cysteine and glycine
B)   cysteine and methionine
C)   histidine and methionine
D)   phenylalanine and tryptophanE) A) and B)
F) A) and C)

Question 2

Which of the following is associated with the quaternary structure of proteins?

Accepted Answer

A)   the sequence of amino acids
B)   hydrogen bonding within the backbone
C)   hydrogen bonding between the side chains
D)   the interaction of protein subunitsE) A) and C)
F) B) and C)

Question 3

What determines the characteristics of an amino acid?

Accepted Answer

A)   its molecular weight
B)   the identity of its side chain
C)   both a and b
D)   neither a nor bE) All of the above
F) C) and D)

Question 4

The denaturing agent urea affects which of the following?

Accepted Answer

A)   hydrogen bonding
B)   disulfide bonds
C)   hydrophobic interactions
D)   salt bridgesE) B) and D)
F) B) and C)

Question 5

Serotonin is formed from which amino acid?

Accepted Answer

A)   phenylalanine
B)   tryptophan
C)   tyrosine
D)   valineE) A) and B)
F) A) and C)

Question 6

Which of the following is not a fibrous protein?

Accepted Answer

A)   actin
B)   collagen
C)   keratin
D)   None, they are all fibrous proteins.E) None of the above
F) B) and C)

Question 7

Which of the following explains the unusually high melting points of amino acids?

Accepted Answer

A)   their formula weights
B)   the polarity of the side chains
C)   the presence of nitrogen atoms
D)   their existence as zwitterionsE) A) and D)
F) A) and C)

Question 8

Which of the following side chains are hydrophobic?

Accepted Answer

A)   acidic
B)   basic
C)   polar but neutral
D)   none of theseE) A) and B)
F) A) and C)

Question 9

Which of the following amino acids has the lowest pI?

Accepted Answer

A)   arginine
B)   cysteine
C)   glycine
D)   glutamic acidE) A) and C)
F) B) and C)

Question 10

In which of the following do both amino acids have a polar but neutral side chain?

Accepted Answer

A)   cysteine and methionine
B)   cysteine and serine
C)   histidine and methionine
D)   phenylalanine and tryptophanE) None of the above
F) All of the above

Question 11

How many different amino acids are commonly found in proteins?

Accepted Answer

A)   10
B)   20
C)   200
D)   1000E) B) and D)
F) B) and C)

Question 12

Which of the following is true of an amino acid at a pH above 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.E) None of the above
F) A) and C)

Question 13

The substance shown below is called cisplatin and is used in the treatment of testicular cancer. [Pt(NH3) 2Cl2]
What is the oxidation state of Pt in this substance?

Accepted Answer

A)   0
B)   +1
C)   +2
D)   +3
E)   +4F) A) and D)
G) C) and D)

Question 14

Using the 20 standard amino acids how many dipeptides containing two different amino acids can be made?

Accepted Answer

A)   20
B)   39
C)   40
D)   380E) A) and B)
F) A) and C)

Question 15

Which of the following is true of the isoelectric point of amino acids?

Accepted Answer

A)   The isoelectric points of all amino acids are the same.
B)   It is the pH at which an amino acid conducts electricity.
C)   It is the pH at which an amino acid has equal numbers of positive and negative charges.
D)   All of the above are true.E) A) and D)
F) B) and C)

Question 16

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

Accepted Answer

A)   phenylalanine
B)   tryptophan
C)   tyrosine
D)   all of theseE) C) and D)
F) A) and B)

Question 17

Which of the following is a type of secondary structure?

Accepted Answer

A)   α-pleated sheet
B)   β-helix
C)   both a and b
D)   neither a nor bE) A) and D)
F) B) and D)

Question 18

Which type of secondary structure can be either intermolecular or intramolecular?

Accepted Answer

A)   α-helix
B)   β-pleated sheet
C)   hairpin turn
D)   all of theseE) None of the above
F) A) and B)

Question 19

What type of chemical reaction is involved in the conversion of cystine to cysteine?

Accepted Answer

A)   addition
B)   reduction
C)   oxidation
D)   substitutionE) A) and C)
F) None of the above

Question 20

How many amino acids have basic side chains?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and D)
F) None of the above

Exam 22: Proteins

In which of the following do both amino acids have a nonpolar side chain?

Correct AnswerverifiedShow Answer

Using the 20 standard amino acids how many dipeptides containing two different amino acids can be made?

Correct AnswerverifiedShow Answer

Which of the following amino acids has the lowest pI?

Correct AnswerverifiedShow Answer

Which type of secondary structure can be either intermolecular or intramolecular?

Correct AnswerverifiedShow Answer

Which of the following is associated with the quaternary structure of proteins?

Correct AnswerverifiedShow Answer

What determines the characteristics of an amino acid?

Correct AnswerverifiedShow Answer

How many amino acids have basic side chains?

Correct AnswerverifiedShow Answer

The substance shown below is called cisplatin and is used in the treatment of testicular cancer. [Pt(NH3) 2Cl2] What is the oxidation state of Pt in this substance?

Correct AnswerverifiedShow Answer

Which of the following explains the unusually high melting points of amino acids?

Correct AnswerverifiedShow Answer

In which of the following do both amino acids have a polar but neutral side chain?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is a type of secondary structure?

Correct AnswerverifiedShow Answer

Serotonin is formed from which amino acid?

Correct AnswerverifiedShow Answer

Which of the following side chains are hydrophobic?

Correct AnswerverifiedShow Answer

Which of the following is true of the isoelectric point of amino acids?

Correct AnswerverifiedShow Answer

How many different amino acids are commonly found in proteins?

Correct AnswerverifiedShow Answer

Which of the following is not a fibrous protein?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What type of chemical reaction is involved in the conversion of cystine to cysteine?

Correct AnswerverifiedShow Answer

The denaturing agent urea affects which of the following?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The substance shown below is called cisplatin and is used in the treatment of testicular cancer. [Pt(NH₃) ₂Cl₂] What is the oxidation state of Pt in this substance?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified