Question 1

What process occurs when heat, acids, bases, and heavy metal ions cause a loss of biological function of a protein?

Accepted Answer

A)  denaturation 
B)  saponification 
C)  hydrogenation 
D)  amidation 
E)  esterification 
A)  denaturation 
B)  saponification 
C)  hydrogenation 
D)  amidation 
E)  esterification

Question 2

Identify the structural level in each protein.
-the combination of two or more protein molecules to form an active protein

Accepted Answer

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

Question 3

Classify each protein by function.
-- CH₂CH₂SCH3

Accepted Answer

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

Question 4

Circle the peptide bond in this structure.

Accepted Answer

The answer of Circle the peptide bond in this structure....

Question 5

Classify each protein by function.
--CH3

Accepted Answer

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

Question 6

Classify each protein by function.
-

Accepted Answer

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

Question 7

Classify each protein by function.
-$$\begin{array} { l } 
- \mathrm { CH } - \mathrm { CH } _ { 2 } - \mathrm { CH } _ { 3 } \
\quad\mid \
\quad\mathrm { CH } _ { 3 }
\end{array}$$

Accepted Answer

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

Question 8

In a typical amino acid zwitterion, the carboxylate end is

Accepted Answer

A)  positively charged. 
B)  negatively charged. 
C)  neutral. 
D)  soluble in a nonpolar solvent. 
E)  attached to an amine. 
A)  positively charged. 
B)  negatively charged. 
C)  neutral. 
D)  soluble in a nonpolar solvent. 
E)  attached to an amine.

Question 9

In sickle-cell anemia, the hemoglobin molecules

Accepted Answer

A)  come apart into separate chains. 
B)  enlarge to twice normal size. 
C)  clump together into insoluble fibers. 
D)  dissolve in the plasma. 
E)  undergo crenation. 
A)  come apart into separate chains. 
B)  enlarge to twice normal size. 
C)  clump together into insoluble fibers. 
D)  dissolve in the plasma. 
E)  undergo crenation.

Question 10

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 11

Collagen can be classified as a __________ protein.

Accepted Answer

The answer of Collagen can be classified as a __________...

Question 12

Classify each protein by function.
-lipoproteins in the blood

Accepted Answer

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

Question 13

The peptide bonds that combine amino acids in a protein are

Accepted Answer

A)  ester bonds. 
B)  ether bonds. 
C)  amide bonds. 
D)  glycosidic bonds. 
E)  sulfide bonds. 
A)  ester bonds. 
B)  ether bonds. 
C)  amide bonds. 
D)  glycosidic bonds. 
E)  sulfide bonds.

Question 14

Wool is primarily made up of

Accepted Answer

A)  protein. 
B)  carbohydrate. 
C)  globin. 
D)  triacylglycerols. 
E)  enkephalin. 
A)  protein. 
B)  carbohydrate. 
C)  globin. 
D)  triacylglycerols. 
E)  enkephalin.

Question 15

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

Question 16

Enkephalins are polypeptides that have

Accepted Answer

A)  a sweet taste. 
B)  a bitter taste. 
C)  extra caloric value. 
D)  pain-killing properties. 
E)  hormone activity. 
A)  a sweet taste. 
B)  a bitter taste. 
C)  extra caloric value. 
D)  pain-killing properties. 
E)  hormone activity.

Question 17

The peptide sequence Gly-Gly-Gly gives the primary structure of a tripeptide.

Accepted Answer

A) True 
 B)False

Question 18

The R group for serine is -CH₂OH. As a zwitterion, serine has the structural formula

Accepted Answer

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

Question 19

Immunoglobulin, a protein that stimulates immune responses, would be classified as a __________ protein.

Accepted Answer

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

Question 20

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.

Exam 19: Amino Acids and Proteins

What process occurs when heat, acids, bases, and heavy metal ions cause a loss of biological function of a protein?

Identify the structural level in each protein. -the combination of two or more protein molecules to form an active protein

Classify each protein by function. -- CH₂CH₂SCH3

Circle the peptide bond in this structure.

Classify each protein by function. --CH3

Classify each protein by function. -

Classify each protein by function. - --- \mid

In a typical amino acid zwitterion, the carboxylate end is

In sickle-cell anemia, the hemoglobin molecules

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.

Collagen can be classified as a __________ protein.

Classify each protein by function. -lipoproteins in the blood

The peptide bonds that combine amino acids in a protein are

Wool is primarily made up of

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)?

Enkephalins are polypeptides that have

The peptide sequence Gly-Gly-Gly gives the primary structure of a tripeptide.

The R group for serine is -CH₂OH. As a zwitterion, serine has the structural formula

Immunoglobulin, a protein that stimulates immune responses, would be classified as a __________ protein.

An acid can denature a protein by

Chemistry and Measurements

Energy and Matter

Atoms and Elements

Nuclear Chemistry

Compounds and Their Bonds

Chemical Reactions and Quantities

Gases

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Introduction to Organic Chemistry: Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Phenols, Thiols, and Ethers

Aldehydes, Ketones, and Chiral Molecules

Carbohydrates

Carboxylic Acids and Esters

Lipids

Amines and Amides

Enzymes and Vitamins

Nucleic Acids and Protein Synthesis

Metabolic Pathways for Carbohydrates

Metabolism and Energy Production

Metabolic Pathways for Lipids and Amino Acids

Filters

Classify each protein by function. -- CH₂CH₂SCH₃

Classify each protein by function. --CH₃