This document contains a 28 question multiple choice exam about organic chemistry concepts. The questions cover topics like elements found in living organisms, atomic structure of molybdenum isotopes, identifying functional groups in molecules, properties of carbohydrates and lipids, and peptide bond hydrolysis. The key provided indicates the correct answer for each question is A, B, C, D, E, etc. respectively.

1. Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which of the following statements is false?
A) Virtually all organisms require the same elements in the same quantities.
B) Iron is an example of an element needed by all organisms.
C) Other than some trace elements, animals are mostly made up of the same elements as
plants, in similar proportions.
D) Some trace elements are very abundant on Earth.
E) Carbon, hydrogen, oxygen, and nitrogen are the most abundant elements of living matter.
1)
2) Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers
of 92, 94, 95, 96, 97, 98, and 100. Therefore, which of the following can be true?
A) The isotopes of molybdenum have between 50 and 58 neutrons and have different
electron configurations.
B) Molybdenum atoms can have between 50 and 58 neutrons.
C) The isotopes of molybdenum can have between 50 and 58 protons.
D) The isotopes of molybdenum have between 50 and 58 protons and have different electron
configurations.
E) The isotopes of molybdenum have different electron configurations.
2)
3) Which of the structures illustrated above is an impossible covalently bonded molecule?
A) A B) B C) C D) D E) E
3)
4) Which of the structures illustrated above contain(s) a carbonyl functional group?
A) A B) C and D C) C D) D E) C and E
4)
5) In which of the structures illustrated above are the atoms bonded by ionic bonds?
A) A
B) B
C) C
D) C, D, and E only
E) none of the structures
5)
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2. 6) Which functional group shown above is characteristic of alcohols?
A) A B) B C) C D) D E) E
6)
7) Which functional group(s) shown above is (are) present in all amino acids?
A) A and B B) B and D C) C only D) D only E) C and D
7)
8) Which of the groups shown above is a carbonyl functional group?
A) A B) B C) C D) D E) E
8)
9) Which of the structures illustrated above cannot form hydrogen bonds with water molecules?
A) A B) B C) C D) D E) E
9)
10) The figure above shows the structures of glucose and fructose. These two molecules differ in the
A) types of carbon, hydrogen, and oxygen atoms.
B) arrangement of carbon, hydrogen, and oxygen atoms.
C) number of carbon, hydrogen, and oxygen atoms; the types of carbon, hydrogen, and
oxygen atoms; and the arrangement of carbon, hydrogen, and oxygen atoms.
D) number of oxygen atoms joined to carbon atoms by double covalent bonds.
E) number of carbon, hydrogen, and oxygen atoms.
10)
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3. Figure 5.1
11) If two molecules of the general type shown in Figure 5.1 were linked together, carbon-1 of one
molecule to carbon-4 of the other, the single molecule that would result would be
A) glucose.
B) sucrose.
C) maltose.
D) galactose.
E) fructose.
11)
12) Which of the following descriptors is true of the molecule shown in Figure 5.1?
A) glucose
B) hexose
C) hexose and glucose only
D) fructose
E) hexose and fructose only
12)
13) DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides
together. What would first happen to DNA molecules treated with DNAase?
A) The two strands of the double helix would separate.
B) The phosphodiester bonds between deoxyribose sugars would be broken.
C) The purines would be separated from the deoxyribose sugars.
D) All bases would be separated from the deoxyribose sugars.
E) The pyrimidines would be separated from the deoxyribose sugars.
13)
14) The R group or side chain of the amino acid serine is –CH2–OH. The R group or side chain of
the amino acid leucine is –CH2–CH–(CH3)2. Where would you expect to find these amino acids
in a globular protein in aqueous solution?
A) Leucine would be in the interior, and serine would be on the exterior of the globular
protein.
B) Both serine and leucine would be in the interior and on the exterior of the globular
protein.
C) Serine would be in the interior, and leucine would be on the exterior of the globular
protein.
D) Both serine and leucine would be in the interior of the globular protein.
E) Both serine and leucine would be on the exterior of the globular protein.
14)
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4. 15) What type of covalent bond between amino acid side chains (R groups) functions in maintaining
a polypeptide's specific three-dimensional shape?
A) ionic bond
B) disulfide bond
C) van der Waals interaction
D) hydrophobic interaction
E) hydrogen bond
15)
16) What maintains the secondary structure of a protein?
A) peptide bonds
B) disulfide bonds
C) hydrogen bonds between the R groups
D) hydrogen bonds between the amino group of one peptide bond and the carboxyl group of
another peptide bond
E) hydrophobic interactions
16)
17) Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to
one galactose molecule. How is lactose classified?
A) as a polysaccharide
B) as a hexose
C) as a disaccharide
D) as a monosaccharide
E) as a pentose
17)
18) All of the following are polysaccharides except
A) lactose.
B) chitin.
C) cellulose.
D) glycogen.
E) amylopectin.
18)
19) Which of the following is true of both starch and cellulose?
A) They are both structural components of the plant cell wall.
B) They can both be digested by humans.
C) They are both polymers of glucose.
D) They are cis-trans isomers of each other.
E) They are both used for energy storage in plants.
19)
20) The molecular formula for glucose is C6H12O6. What would be the molecular formula for a
molecule made by linking three glucose molecules together by dehydration reactions?
A) C18H10O15
B) C18H32O16
C) C6H10O5
D) C18H36O18
E) C3H6O3
20)
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5. Figure 5.2
21) Which of the following statements is true regarding the molecule illustrated in Figure 5.2?
A) It is a saturated fatty acid.
B) It is a saturated fatty acid, a diet rich in this molecule may contribute to atherosclerosis,
and molecules of this type are usually liquid at room temperature.
C) Molecules of this type are usually liquid at room temperature.
D) A diet rich in this molecule may contribute to atherosclerosis.
E) It is a saturated fatty acid and a diet rich in this molecule may contribute to
atherosclerosis.
21)
Figure 5.3
22) Which of the following statements is true regarding the molecule illustrated in Figure 5.3?
A) A diet rich in this molecule may contribute to atherosclerosis.
B) Molecules of this type are usually liquid at room temperature.
C) It is a saturated fatty acid.
D) It is a saturated fatty acid, a diet rich in this molecule may contribute to atherosclerosis,
and molecules of this type are usually liquid at room temperature.
E) It is a saturated fatty acid and a diet rich in this molecule may contribute to
atherosclerosis.
22)
23) The molecule shown in Figure 5.3 is a
A) unsaturated fatty acid.
B) polypeptide.
C) saturated fatty acid.
D) polysaccharide.
E) triacylglycerol.
23)
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6. Figure 5.4
24) What is the structure shown in Figure 5.4?
A) oligosaccharide molecule
B) pentose molecule
C) steroid molecule
D) fatty acid molecule
E) phospholipid molecule
24)
Figure 5.5
25) Which of the following statements is/are true regarding the chemical reaction illustrated in
Figure 5.5?
A) It is a hydrolysis reaction, it results in a peptide bond, and it joins two fatty acids together.
B) It is a hydrolysis reaction.
C) It joins two fatty acids together.
D) It results in a peptide bond.
E) It is a hydrolysis reaction and it results in a peptide bond.
25)
Refer to Figure 5.6 to answer the following questions.
Figure 5.6
26) At which bond would water need to be added to achieve hydrolysis of the peptide, back to its
component amino acid?
A) A B) B C) C D) D E) E
26)
27) Which bond is a peptide bond?
A) A B) B C) C D) D E) E
27)
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7. 28) Which bond is closest to the amino terminus of the molecule?
A) A B) B C) C D) D E) E
28)
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8. Answer Key
Testname: MOCK TEST 1 UCONN
1) A
2) B
3) C
4) D
5) E
6) A
7) E
8) B
9) B
10) B
11) C
12) C
13) B
14) A
15) B
16) D
17) C
18) A
19) C
20) B
21) E
22) B
23) A
24) C
25) D
26) C
27) C
28) A
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