Question 1

The structural formulas of amino acids are the same EXCEPT for the

Accepted Answer

A) carboxyl group. 
B) alpha carbon. 
C) amino group. 
D) side (R)group. 
E) hydrogen bonding. 
A) carboxyl group. 
B) alpha carbon. 
C) amino group. 
D) side (R)group. 
E) hydrogen bonding. D

Question 2

Zwitterions have an overall positive charge.

Accepted Answer

A) True 
 B)False  False

Question 3

At a pH < 5, the zwitterion for alanine (pI = 6) will have

Accepted Answer

A) a net positive charge. 
B) a net negative charge. 
C) an overall charge of zero. 
D) low solubility in water. 
E) a negative charge on the carboxyl group. 
A) a net positive charge. 
B) a net negative charge. 
C) an overall charge of zero. 
D) low solubility in water. 
E) a negative charge on the carboxyl group. A

Question 4

Which of the following functional groups of an amino acid would be in the ionized state at high pH?

Accepted Answer

A)   
B) -CH2OH 
C) -CH₃ 
D)    
E)    
A)   
B) -CH2OH 
C) -CH₃ 
D)    
E)

Question 5

Amino acids that are not synthesized in the body but must be ingested with the diet are called ________ amino acids.

Accepted Answer

The answer of Amino acids that are not synthesized in...

Question 6

What is the structural formula of glutamic acid (pI = 3.2) at pH = 1?

Accepted Answer

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

Question 7

One heavy metal that can cause denaturation of a protein is

Accepted Answer

A) silver. 
B) sodium. 
C) barium. 
D) iron. 
E) calcium. 
A) silver. 
B) sodium. 
C) barium. 
D) iron. 
E) calcium.

Question 8

Disulfide bonds in a protein chain connect

Accepted Answer

A) an amine and a carboxylic acid group. 
B) an alcohol and a carboxylic acid group. 
C) tryptophan and alanine residues. 
D) two cysteine residues. 
E) two asparagine residues. 
A) an amine and a carboxylic acid group. 
B) an alcohol and a carboxylic acid group. 
C) tryptophan and alanine residues. 
D) two cysteine residues. 
E) two asparagine residues.

Question 9

The interactions that are important in the secondary structure of a protein are

Accepted Answer

A) hydrogen bonds. 
B) hydrophobic interactions. 
C) disulfide bonds. 
D) salt bridges. 
E) peptide bonds. 
A) hydrogen bonds. 
B) hydrophobic interactions. 
C) disulfide bonds. 
D) salt bridges. 
E) peptide bonds.

Question 10

An acid can denature a protein by

Accepted Answer

A) agitating the protein chains. 
B) disrupting hydrogen bonds between R groups chains. 
C) disrupting hydrophobic interactions within a protein chain. 
D) removing helping molecules such as heme. 
E) breaking disulfide bridges. 
A) agitating the protein chains. 
B) disrupting hydrogen bonds between R groups chains. 
C) disrupting hydrophobic interactions within a protein chain. 
D) removing helping molecules such as heme. 
E) breaking disulfide bridges.

Question 11

What type of interaction would you expect between the following R groups in the tertiary structure of a protein?

Accepted Answer

A) disulfide bonds 
B) salt bridges 
C) hydrogen bonds 
D) hydrophobic interactions 
E) peptide bonds 
A) disulfide bonds 
B) salt bridges 
C) hydrogen bonds 
D) hydrophobic interactions 
E) peptide bonds

Question 12

Consider a mixture of the amino acids lysine (pI = 9.7), tyrosine (pI = 5.7), and glutamic acid (pI = 3.2) at a pH 5.7 that is subjected to an electric current. ________ will remain stationary.

Accepted Answer

A) Lysine 
B) Tyrosine 
C) Glutamic acid 
D) All of the amino acids 
A) Lysine 
B) Tyrosine 
C) Glutamic acid 
D) All of the amino acids

Question 13

Hemoglobin has a total of ________ protein chains in its quaternary structure.

Accepted Answer

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

Question 14

A chain made of more than 50 amino acids is usually referred to as a(n)

Accepted Answer

A) peptide. 
B) protein. 
C) enzyme. 
D) globulin. 
E) hormone. 
A) peptide. 
B) protein. 
C) enzyme. 
D) globulin. 
E) hormone.

Question 15

The α helix of the secondary structure of a protein is held together by ________ between two widely separated parts of a protein chain.

Accepted Answer

A) hydrogen bonds 
B) disulfide bridges 
C) salt bridges 
D) hydrophilic interactions 
E) hydrophobic interactions 
A) hydrogen bonds 
B) disulfide bridges 
C) salt bridges 
D) hydrophilic interactions 
E) hydrophobic interactions

Question 16

Sucrase, the protein that facilitates the hydrolysis of sucrose, would be classified as a ________ protein.

Accepted Answer

A) transport 
B) hormonal 
C) catalytic 
D) structural 
E) contractile 
A) transport 
B) hormonal 
C) catalytic 
D) structural 
E) contractile

Question 17

Which of the following shows all of the tripeptides that can be formed from one molecule each of lysine (Lys), threonine (Thr), and histidine (His)?

Accepted Answer

A) Lys-Thr-His 
B) Lys-Thr-His, Lys-His-Thr, His-Thr-Lys, His-Lys-Thr, Thr-Lys-His, Thr-His-Lys 
C) Lys-Thr-His, Lys-His-Thr, His-Lys-Thr, Thr-His-Lys 
D) Lys-Thr-His, Lys-His-Thr, His-Lys-Thr 
E) Lys-Thr-His, Lys-His-Thr 
A) Lys-Thr-His 
B) Lys-Thr-His, Lys-His-Thr, His-Thr-Lys, His-Lys-Thr, Thr-Lys-His, Thr-His-Lys 
C) Lys-Thr-His, Lys-His-Thr, His-Lys-Thr, Thr-His-Lys 
D) Lys-Thr-His, Lys-His-Thr, His-Lys-Thr 
E) Lys-Thr-His, Lys-His-Thr

Question 18

Amino acids that are not synthesized in the body and must be obtained from the diet are called

Accepted Answer

A) essential. 
B) polar. 
C) nonpolar. 
D) complete. 
E) incomplete. 
A) essential. 
B) polar. 
C) nonpolar. 
D) complete. 
E) incomplete.

Question 19

The function of myoglobin is to

Accepted Answer

A) carry vitamins in the blood. 
B) carry oxygen in the blood. 
C) support the skeletal muscles. 
D) carry oxygen in the muscle. 
E) provide strength in cartilage. 
A) carry vitamins in the blood. 
B) carry oxygen in the blood. 
C) support the skeletal muscles. 
D) carry oxygen in the muscle. 
E) provide strength in cartilage.

Question 20

Which of the following shows all of the tripeptides that can be formed from one molecule each of glycine (Gly), valine (Val), and leucine (Leu)?

Accepted Answer

A) Gly-Val-Leu, Gly-Leu-Val, Val-Leu-Gly, Val-Gly-Leu, Leu-Gly-Val, Leu-Val-Gly 
B) Gly-Val-Leu, Gly-Leu-Val, Leu-Gly-Val 
C) Val-Gly-Leu, Gly-Val-Leu, Gly-Leu-Val, Leu-Gly-Val 
D) Val-Gly-Leu, Gly-Leu-Val 
E) Gly-Val-Leu 
A) Gly-Val-Leu, Gly-Leu-Val, Val-Leu-Gly, Val-Gly-Leu, Leu-Gly-Val, Leu-Val-Gly 
B) Gly-Val-Leu, Gly-Leu-Val, Leu-Gly-Val 
C) Val-Gly-Leu, Gly-Val-Leu, Gly-Leu-Val, Leu-Gly-Val 
D) Val-Gly-Leu, Gly-Leu-Val 
E) Gly-Val-Leu

Exam 19: Amino Acids and Proteins

The structural formulas of amino acids are the same EXCEPT for the

Zwitterions have an overall positive charge.

At a pH < 5, the zwitterion for alanine (pI = 6) will have

Which of the following functional groups of an amino acid would be in the ionized state at high pH?

Amino acids that are not synthesized in the body but must be ingested with the diet are called ________ amino acids.

What is the structural formula of glutamic acid (pI = 3.2) at pH = 1?

One heavy metal that can cause denaturation of a protein is

Disulfide bonds in a protein chain connect

The interactions that are important in the secondary structure of a protein are

An acid can denature a protein by

What type of interaction would you expect between the following R groups in the tertiary structure of a protein?

Consider a mixture of the amino acids lysine (pI = 9.7), tyrosine (pI = 5.7), and glutamic acid (pI = 3.2) at a pH 5.7 that is subjected to an electric current. ________ will remain stationary.

Hemoglobin has a total of ________ protein chains in its quaternary structure.

A chain made of more than 50 amino acids is usually referred to as a(n)

The α helix of the secondary structure of a protein is held together by ________ between two widely separated parts of a protein chain.

Sucrase, the protein that facilitates the hydrolysis of sucrose, would be classified as a ________ protein.

Which of the following shows all of the tripeptides that can be formed from one molecule each of lysine (Lys), threonine (Thr), and histidine (His)?

Amino acids that are not synthesized in the body and must be obtained from the diet are called

The function of myoglobin is to

Which of the following shows all of the tripeptides that can be formed from one molecule each of glycine (Gly), valine (Val), and leucine (Leu)?

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