26 Jun I am ahead, but I want to make sure I am getting these answers
Question
CHAPTER 14 PROTEINS
1. How is the tripeptide shown designated?
a. Ala-Cys-Asp
b. Ala-Cys-Glu
c. Asp-Cys-Ala
d. Glu-Cys-Ala
2. How is the tripeptide designated?
a. Ala-Cys-Asp
b. Ala-Cys-Glu
c. Asp-Cys-Ala
d. Glu-Cys-Ala
3. Which of the following is glycylalanine?
a.
c.
b.
d.
4. When will a protein have a net positive charge?
a.
b.
c.
d.
always
never
when the pH is above its isoelectric point
when the pH is below its isoelectric point
5. When will a protein have a net negative charge?
a. always
b. never
c. when the pH is above its isoelectric point
d. when the pH is below its isoelectric point
6. When will a protein have the lowest solubility?
a. when the pH is very low
b. when the pH = 7
c. when the pH is very high
d. at its isoelectric point
7. Which of the following is true of proteins?
a.
b.
c.
d.
All proteins are acidic.
All proteins are basic.
All proteins are neutral.
The acid/base properties of a protein depend on the identity of its side chains.
8. Which of the following defines the primary structure of proteins?
a.
b.
c.
d.
the geometric arrangement of the backbone atoms
the geometric arrangement of the side chains
the sequence of the amino acids
all of the above
9. How many dipeptides can be made using the 20 standard amino acids?
a. 20
b. 40
c. 200
d. 400
10. Consider the following image.
What type of interaction is depicted by the dashed line?
a. hydrogen bonding
b. covalent bonding
c. hydrophobic interactions
d. salt bridges
CHAPTER 12 CARBOHYDRATES
1. For the solvents water, ethanol, and benzene which gives the correct order of solubility of
monosaccharides?
a. benzene > ethanol > water
b. benzene > water > ethanol
c. water > ethanol > benzene
d. water > benzene > ethanol
2. The cyclic structures of monosaccharides are which of the following?
a. acetals
b. hemiacetals
c. ethers
d. esters
3. The reaction of monosaccharides to form a disaccharide is an example of which of the following
reactions?
a. condensation
b. hydrolysis
c. reduction
d. oxidation
4. Complete hydrolysis of which of the following disaccharides yields a single monosaccharide?
a. lactose
b. maltose
c. sucrose
d. none of these
5. Which of the following is obtained as a result of the complete hydrolysis of starch?
a. D-glucose
b. lactose
c. maltose
d. sucrose
6. Glycogen is structurally similar to which of the following?
a. amylopectin
b. amylose
c. cellulose
d. none of these
7. Examine the following structures.
A
B
Which substance would be classified as an aldopentose?
a. A
b. B
c. C
d. D
C
D
C
D
8. Examine the following structures.
A
B
Which substance would be classified as an ketohexose?
a. A
b. B
c. C
d. D
9. Examine the following structures.
A
B
Which substance would be classified as an aldohexose?
a. A
b. B
c. C
d. D
C
D
C
D
10. Examine the following structures.
A
B
Which substance has an L-configuration?
a. A
b. B
c. C
d. D
CHAPTER 13 LIPIDS
1. Which of the following is true of most fatty acids found in triglycerides?
a.
b.
c.
d.
They are unbranched.
They contain more than 20 carbon atoms.
They contain an odd number of carbon atoms.
none of the above
2. Which of the following type of reaction is involved in saponification?
a. condensation
b. dehydration
c. hydrogenation
d. hydrolysis
3. Which of the following is a reactant in a saponification reaction?
a. a strong acid
b. a weak acid
c. a strong base
d. a weak base
4. How many rings are associated with the steroid structure?
a. 3
b. 4
c. 5
d. 6
5. Which of the following structural arrangements is the steroid structure?
a.
c.
b.
d.
6. Consider the following structure.
Which of the following is a correct classification for this substance?
a. fatty acid
b. glycerol
c. triglyceride
d. diester
7. Which number in the diagram represents the glycerol backbone of this structure?
a.
b.
c.
d.
1
2
3
5
8. Which number in the diagram represents an ester linkage?
a.
b.
c.
d.
1
2
3
4
9. Which number in the diagram represents an unsaturated fatty acid?
a.
b.
c.
d.
1
2
3
4
10. Fatty acids contain:
a. amine groups
b. amide groups
c. carboxylic acid groups
d. anhydride groups
CHAPTER 14 PROTEINS
1. How is the tripeptide shown designated?
a. Ala-Cys-Asp
b. Ala-Cys-Glu
c. Asp-Cys-Ala
d. Glu-Cys-Ala
2. How is the tripeptide designated?
a. Ala-Cys-Asp
b. Ala-Cys-Glu
c. Asp-Cys-Ala
d. Glu-Cys-Ala
3. Which of the following is glycylalanine?
a.
c.
b.
d.
4. When will a protein have a net positive charge?
a.
b.
c.
d.
always
never
when the pH is above its isoelectric point
when the pH is below its isoelectric point
5. When will a protein have a net negative charge?
a. always
b. never
c. when the pH is above its isoelectric point
d. when the pH is below its isoelectric point
6. When will a protein have the lowest solubility?
a. when the pH is very low
b. when the pH = 7
c. when the pH is very high
d. at its isoelectric point
7. Which of the following is true of proteins?
a.
b.
c.
d.
All proteins are acidic.
All proteins are basic.
All proteins are neutral.
The acid/base properties of a protein depend on the identity of its side chains.
8. Which of the following defines the primary structure of proteins?
a.
b.
c.
d.
the geometric arrangement of the backbone atoms
the geometric arrangement of the side chains
the sequence of the amino acids
all of the above
9. How many dipeptides can be made using the 20 standard amino acids?
a. 20
b. 40
c. 200
d. 400
10. Consider the following image.
What type of interaction is depicted by the dashed line?
a. hydrogen bonding
b. covalent bonding
c. hydrophobic interactions
d. salt bridges
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