Question 1

In an enzyme, the polypeptide chain folds into a compact shape known as the __________ structure.

Accepted Answer

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

Question 2

The heme in hemoglobin is a(n)

Accepted Answer

A)  protein chain. 
B)  small molecule within a protein. 
C)  helix area in the hemoglobin molecule. 
D)  pleated sheet area in the hemoglobin molecule. 
E)  oxygen molecule within the hemoglobin molecule. 
A)  protein chain. 
B)  small molecule within a protein. 
C)  helix area in the hemoglobin molecule. 
D)  pleated sheet area in the hemoglobin molecule. 
E)  oxygen molecule within the hemoglobin molecule.

Question 3

In insulin, two peptide chains are held together in a single unit by

Accepted Answer

A)  disulfide bridges. 
B)  hydrogen bonds. 
C)  salt bridges. 
D)  a prosthetic group. 
E)  a β-pleated sheet. 
A)  disulfide bridges. 
B)  hydrogen bonds. 
C)  salt bridges. 
D)  a prosthetic group. 
E)  a β-pleated sheet.

Question 4

Classify each protein by function.
-

Accepted Answer

A) hydrophobic 
B) both 
C) hydrophilic 
A) hydrophobic 
B) both 
C) hydrophilic

Question 5

Classify each protein by function.
-

Accepted Answer

A) hydrophobic 
B) both 
C) hydrophilic 
A) hydrophobic 
B) both 
C) hydrophilic

Question 6

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 7

Identify the structural level in each protein.
-pleated sheet

Accepted Answer

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

Question 8

Classify each protein by function.
-collagen in tendons and cartilage

Accepted Answer

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

Question 9

At a pH > 9, the zwitterion of glycine (pI=6.0) 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 nitrogen. 
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 nitrogen.

Question 10

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

Accepted Answer

A)  $\begin{array} { c } 
\mathrm { O } \
\| \
- \mathrm { COH }
\end{array}$ 
B)  -CH?OH 
C)  -CH3 
D)  $\begin{array} { c } 
\mathrm { O } \
\| \
- \mathrm { CNH } _ { 2 }
\end{array}$ 
E)    
A)  $\begin{array} { c } 
\mathrm { O } \
\| \
- \mathrm { COH }
\end{array}$ 
B)  -CH?OH 
C)  -CH3 
D)  $\begin{array} { c } 
\mathrm { O } \
\| \
- \mathrm { CNH } _ { 2 }
\end{array}$ 
E)

Question 11

Which of the following is NOT a function of proteins?

Accepted Answer

A)  provide structural components 
B)  stores the genetic information of a living organism 
C)  movement of muscles 
D)  catalyze reactions in the cells 
E)  transport substances through the bloodstream 
A)  provide structural components 
B)  stores the genetic information of a living organism 
C)  movement of muscles 
D)  catalyze reactions in the cells 
E)  transport substances through the bloodstream

Question 12

In digestion, proteins are broken down into amino acids by a(n) __________ reaction.

Accepted Answer

A)  saponification 
B)  reduction 
C)  hydrolysis 
D)  oxidation 
E)  denaturation 
A)  saponification 
B)  reduction 
C)  hydrolysis 
D)  oxidation 
E)  denaturation

Question 13

In the peptide Ser-Cys-Ala-Gly, the C-terminal end is

Accepted Answer

A)  serine. 
B)  serotonin. 
C)  glycine. 
D)  glycerine. 
E)  alanine. 
A)  serine. 
B)  serotonin. 
C)  glycine. 
D)  glycerine. 
E)  alanine.

Question 14

The isoelectric point for any amino acid is the pH at which the amino acid has a net charge of __________.

Accepted Answer

The answer of The isoelectric point for any amino acid...

Question 15

A completely vegetarian diet will contain all the essential amino acids if it includes

Accepted Answer

A)  wheat and rice. 
B)  rice and beans. 
C)  almonds and walnuts. 
D)  corn and beans. 
E)  wheat and corn. 
A)  wheat and rice. 
B)  rice and beans. 
C)  almonds and walnuts. 
D)  corn and beans. 
E)  wheat and corn.

Question 16

Hydrophobic interactions help to stabilize the __________ structure(s) of a protein.

Accepted Answer

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

Question 17

What amino acids have polar R groups that are attracted to water?

Accepted Answer

A)  hydrophilic 
B)  hydrophobic 
C)  nonpolar 
D)  aromatic 
E)  hydrocarbon 
A)  hydrophilic 
B)  hydrophobic 
C)  nonpolar 
D)  aromatic 
E)  hydrocarbon

Question 18

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 migrate towards the positive electrode(+).

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 19

Lysine and glutamic acid form hydrophobic interactions.

Accepted Answer

A) True 
 B)False

Question 20

Classify each protein by function.
-

Accepted Answer

A) hydrophobic 
B) both 
C) hydrophilic 
A) hydrophobic 
B) both 
C) hydrophilic

Exam 19: Amino Acids and Proteins

In an enzyme, the polypeptide chain folds into a compact shape known as the __________ structure.

The heme in hemoglobin is a(n)

In insulin, two peptide chains are held together in a single unit by

Classify each protein by function. -

Classify each protein by function. -

The function of myoglobin is to

Identify the structural level in each protein. -pleated sheet

Classify each protein by function. -collagen in tendons and cartilage

At a pH > 9, the zwitterion of glycine (pI=6.0) will have

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

Which of the following is NOT a function of proteins?

In digestion, proteins are broken down into amino acids by a(n) __________ reaction.

In the peptide Ser-Cys-Ala-Gly, the C-terminal end is

The isoelectric point for any amino acid is the pH at which the amino acid has a net charge of __________.

A completely vegetarian diet will contain all the essential amino acids if it includes

Hydrophobic interactions help to stabilize the __________ structure(s) of a protein.

What amino acids have polar R groups that are attracted to water?

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 migrate towards the positive electrode(+).

Lysine and glutamic acid form hydrophobic interactions.

Classify each protein by function. -

Chemistry and Measurements

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