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Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Figure 2.1
1) Which compound in Figure 2.1 is an ester?
A) a
B) b
C) c
Answer: D
Explanation:
D) d
E) e
A)
B)
C)
D)
E)
2) A scientist wants to perform a test that will indicate whether a nucleic acid sample is composed of
RNA or DNA. Testing for the presence of which of the following is most appropriate in this
situation?
A) uracil
B) nitrogen
C) thymine
D) guanine
E) phosphate
Answer: A
Explanation:
2)
A)
B)
C)
D)
E)
3) The antimicrobial drug imidazole inhibits sterol synthesis. This would most likely interfere with
A) prokaryotic plasma membranes.
B) eukaryotic plasma membranes.
C) bacterial cell walls.
D) genes.
E) fungal cell walls.
Answer: B
Explanation:
1)
A)
B)
C)
D)
E)
1
3)
4) Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a
cell can then be followed. Assume Saccharomyces cerevisiae is grown in a nutrient medium
containing the radioisotope 35S. After a 48-hour incubation, the 35S would most likely be found in
4)
the S. cerevisiae’s
A) water.
B) nucleic acids.
C) proteins.
D) carbohydrates.
E) lipids.
Answer: C
Explanation:
A)
B)
C)
D)
E)
5) What is the type of bond between ions in salt?
A) covalent bond
B) hydrogen bond
Answer: C
Explanation:
C) ionic bond
5)
A)
B)
C)
6) Antacids neutralize acid by the following reaction. Identify the salt in the following equation:
Mg(OH)2 + 2HCl MgCl2 + H2 O
6)
A) HCl
B) H2 O
C) MgCl2
D) Mg(OH)2
E) None of the answers is correct.
Answer: C
Explanation:
A)
B)
C)
D)
E)
7) Structurally, ATP is most like which type of molecule?
A) carbohydrate
B) lipid
C) nucleic acid
Answer: C
Explanation:
A)
B)
C)
D)
2
D) protein
7)
8) Identify the following reaction: HCl + NaHCO3
A) dehydration synthesis reaction
B) hydrolysis reaction
C) reversible reaction
D) ionic reaction
E) exchange reaction
Answer: E
Explanation:
NaCl + H2 CO3
8)
A)
B)
C)
D)
E)
Table 2.1
16
O
8
12
C
6
1
H
1
9) Using the information in Table 2.1, calculate the number of moles in 92 grams of ethanol,
C2 H5 OH.
A) 1
B) 2
C) 3
D) 4
E) The answer cannot be determined.
Answer: B
Explanation:
A)
B)
C)
D)
E)
3
9)
Table 2.2
Na+ + OHH+ + F- acid
NaOH
HF
base
MgSO4
Mg2+ + SO4 2-
salt
KH2 PO4
K+ H2 PO4 –
acid
H2 SO4
2H+ + SO4 2-
salt
10) Which of the following statements about the reactions in Table 2.2 is FALSE?
A) They are dissociation reactions.
B) They are exchange reactions.
C) They are reversible reactions.
D) They are ionization reactions.
E) They occur when the reactants are dissolved in water.
Answer: B
Explanation:
A)
B)
C)
D)
E)
11) Identify the following reaction: Glucose + Fructose
A) hydrolysis reaction
B) reversible reaction
C) ionic reaction
D) dehydration synthesis reaction
E) exchange reaction
Answer: D
Explanation:
Sucrose + Water
11)
A)
B)
C)
D)
E)
12) Most amino acids found in cells demonstrate what type of chirality?
A) D-isomers
B) A-isomers
C) L-iosmers
D) B-isomers
E) C-isomers
Answer: C
Explanation:
10)
A)
B)
C)
D)
E)
4
12)
13) Which of the following is a base?
A) C2 H5 OCOOH H+ + C2 H5 OCOO-
13)
B) NaOH Na+ + OHC) C2 H5 OH
D) H2 O
H+ + OH-
E) H2 CO
Answer: B
Explanation:
A)
B)
C)
D)
E)
Figure 2.3
14) What kind of bond is at the arrow in Figure 2.3?
A) double covalent bond
B) hydrogen bond
C) peptide bond
D) disulfide bridge
E) ionic bond
Answer: C
Explanation:
14)
A)
B)
C)
D)
E)
15) What is the type of bond holding hydrogen and oxygen atoms in the H2 O molecule?
A) ionic bond
Answer: C
Explanation:
B) hydrogen bond
A)
B)
C)
5
C) covalent bond
15)
16) Identify the following reaction: NH4 OH
A) dehydration synthesis reaction
B) exchange reaction
C) reversible reaction
D) hydrolysis reaction
E) ionic reaction
Answer: C
Explanation:
16)
A)
B)
C)
D)
E)
17) What do genes consist of?
A) nucleic acids
Answer: A
Explanation:
NH3 + H2 O
B) proteins
C) carbohydrates
D) lipids
A)
B)
C)
D)
18) An E. coli culture that has been growing at 37°C is moved to 25°C. Which of the following changes
must be made in its plasma membrane?
A) The number of saturated chains must increase.
B) The number of phosphate groups must increase.
C) The viscosity must increase.
D) The number of unsaturated chains must increase.
E) No changes are necessary.
Answer: D
Explanation:
18)
A)
B)
C)
D)
E)
19) Two antiparallel strands of DNA combine to form a double helix. The specific interactions that
permit this phenomenon occur by way of ________ bonds between ________.
A) ionic; deoxyriboses
B) hydrogen; deoxyriboses
C) ionic; phosphate groups
D) hydrogen; nitrogenous bases
E) ionic; nitrogenous bases
Answer: D
Explanation:
17)
A)
B)
C)
D)
E)
6
19)
Table 2.1
16
O
8
12
C
6
1
H
1
20) Using the information in Table 2.1, calculate the molecular weight of ethanol, C2 H5 OH.
20)
A) 33
B) 34
C) 96
D) 46
E) The answer cannot be determined.
Answer: D
Explanation:
A)
B)
C)
D)
E)
21) What is the type of bond between carbon, hydrogen, and oxygen atoms in organic molecules?
A) ionic bond
B) hydrogen bond
C) covalent bond
Answer: C
Explanation:
A)
B)
C)
22) Which of the following statements is FALSE?
A) Water molecules are formed by hydrolysis.
B) Salts readily dissolve in water.
C) Water freezes from the top down.
D) Water is a polar molecule.
E) Water is a part of a dehydration synthesis reaction.
Answer: A
Explanation:
21)
A)
B)
C)
D)
E)
7
22)
Figure 2.1
23) Which compound in Figure 2.1 is an organic acid?
A) a
B) b
C) c
Answer: A
Explanation:
C) c
D) d
E) e
A) lipid
24)
B) protein
25)
C) carbohydrate
D) nucleic acid
A)
B)
C)
D)
26) What is the type of bond between the hydrogen of one molecule and the nitrogen of another
molecule?
A) ionic bond
B) hydrophobic bond
C) hydrogen bond
D) disulfide bond
E) covalent bond
Answer: C
Explanation:
23)
A)
B)
C)
D)
E)
25) Which type of molecule is composed of (CH2 O) units?
Answer: C
Explanation:
E) e
A)
B)
C)
D)
E)
24) In Figure 2.1, which is an alcohol?
A) a
B) b
Answer: C
Explanation:
D) d
A)
B)
C)
D)
E)
8
26)
27) Which type of molecule NEVER contains a phosphate group?
A) nucleic acid
B) triglycerides
C) lipid
Answer: B
Explanation:
D) ATP
A)
B)
C)
D)
28) Which of the following statements regarding protein structure is FALSE?
A) Secondary structures are formed only from hydrogen bonds.
B) Tertiary structures are formed only from covalent bonds.
C) Quaternary structures involved multiple polypeptides.
D) The primary structure is formed by covalent bonding between amino acid subunits.
Answer: B
Explanation:
27)
28)
A)
B)
C)
D)
29) Which of the following pairs is mismatched?
A) H2 SO4 2H+ + SO4 2- — acid
B) MgSO4
Mg2+ + SO4 2- — salt
C) KH2 PO4
K+ + H2 PO4 – — acid
29)
Na+ + OH- — base
H+ + F- — acid
D) NaOH
E) HF
Answer: C
Explanation:
A)
B)
C)
D)
E)
30) Which type of molecule contains -NH2 groups?
A) nucleic acid
Answer: B
Explanation:
30)
B) protein
C) triglycerides
D) carbohydrate
A)
B)
C)
D)
31) Which of the following is the type of bond between molecules of water in a beaker of water?
A) covalent bond
B) hydrogen bond
C) ionic bond
Answer: B
Explanation:
A)
B)
C)
9
31)
32) Two glucose molecules are combined to make a maltose molecule. What is the chemical formula
for maltose?
A) C12H22O11
32)
B) C12H24O12
C) C12H23O10
D) C6 H12O6
E) C3 H6 O3
Answer: A
Explanation:
A)
B)
C)
D)
E)
33) If an amino acid contained a hydrocarbon as its side group, in which of the following categories
could it be appropriately designated?
A) polar
B) basic
C) hydrophilic
D) acidic
E) nonpolar
Answer: E
Explanation:
A)
B)
C)
D)
E)
10
33)
Figure 2.2
34) Archaea differ from bacteria in the composition of the cell membrane lipids. Archaea have
ether-bonded lipids, shown in part ________ of Figure 2.2, and bacteria have ester-bonded lipids,
shown in part ________ of Figure 2.2.
A) b; c
B) d; c
C) a; d
D) b; a
E) c; d
Answer: D
Explanation:
A)
B)
C)
D)
E)
35) Which type of molecule contains the alcohol glycerol?
A) carbohydrate
B) protein
C) phospholipids
Answer: C
Explanation:
34)
A)
B)
C)
D)
11
D) DNA
35)
36) Starch, dextran, glycogen, and cellulose are polymers of
A) amino acids.
B) fatty acids.
C) glucose.
D) acids.
E) nucleic acids.
Answer: C
Explanation:
A)
B)
C)
D)
E)
37) Which molecule is composed of a chain of amino acids?
A) nucleic acid
B) lipid
C) protein
Answer: C
Explanation:
36)
D) carbohydrate
A)
B)
C)
D)
38) Desulfovibrio bacteria can perform the following reaction: S 6- S2- . These bacteria are
A) hydrolyzing sulfur.
B) oxidizing sulfur.
C) synthesizing sulfur.
D) reducing sulfur.
Answer: B
Explanation:
38)
A)
B)
C)
D)
39) Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a
cell can then be followed. Assume Saccharomyces cerevisiae is grown in a nutrient medium
containing the radioisotope 32P. After a 48-hour incubation, the majority of the 32P would be
found in the S. cerevisiae’s
A) water.
B) carbohydrates.
C) cell wall.
D) proteins.
E) plasma membrane.
Answer: E
Explanation:
37)
A)
B)
C)
D)
E)
12
39)
40) If you viewed one single protein using a microscope, you would observe multiple ________
structures.
A) secondary
B) tertiary
C) primary
D) primary and secondary
E) secondary and tertiary
Answer: A
Explanation:
40)
A)
B)
C)
D)
E)
41) Identify the following reaction: Lactose + H2 O
Glucose + Galactose
41)
A) exchange reaction
B) dehydration synthesis reaction
C) reversible reaction
D) ionic reaction
E) hydrolysis reaction
Answer: E
Explanation:
A)
B)
C)
D)
E)
42) Which are the primary molecules making up plasma membranes in cells?
A) nucleic acids
B) carbohydrates
C) lipids
Answer: C
Explanation:
A)
B)
C)
D)
43) Which of the following statements about the atom
12
C is FALSE?
6
A) Its atomic weight is 12.
B) Its atomic number is 6.
C) It has 12 neutrons in its nucleus.
D) It has 6 protons in its nucleus.
E) It has 6 electrons orbiting the nucleus.
Answer: C
Explanation:
D) proteins
42)
A)
B)
C)
D)
E)
13
43)
44) Based upon the valence numbers of the elements magnesium (2) and hydrogen (1), predict how
many covalent bonds would form between these atoms to achieve the full complement of electrons
in their outermost energy shells.
A) one
B) two
C) three
D) four
Answer: B
Explanation:
A)
B)
C)
D)
45) Which of the following is the type of bond holding K+ and I- ions in KI?
A) covalent bond
B) ionic bond
C) hydrogen bond
Answer: B
Explanation:
44)
45)
A)
B)
C)
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
46) Any compound that contains carbon is only considered to be organic.
Answer:
True
Explanation:
False
47) The density of liquid water is greater than the density of ice.
Answer:
True
Explanation:
49)
False
50) The formation of ADP from ATP can be defined as a hydrolytic reaction.
Answer:
True
Explanation:
51)
False
52) Individual covalent bonds are stronger than individual ionic bonds.
Answer:
True
Explanation:
50)
False
51) There are some forms of life on Earth that can survive without water.
Answer:
True
Explanation:
48)
False
49) All forms of life function optimally at a pH of 7.
Answer:
True
Explanation:
47)
False
48) Elements only achieve the full complement of electrons in outermost energy cells by donating or
sharing electrons.
Answer:
True
Explanation:
46)
False
14
52)
53) Covalent bonds are always shared equally.
Answer:
True
Explanation:
53)
False
54) All chemical reactions are, in theory, reversible.
Answer:
True
Explanation:
54)
False
55) A basic solution is expected to contain more hydrogen ions than hydroxyl ions.
Answer:
True
Explanation:
55)
False
ESSAY. Write your answer in the space provided or on a separate sheet of paper.
56) A bacterium that grows at a temperature of 37°C transports both glucose and NaCl into its cytoplasm. Which is
most easily dissolved in the cytoplasm? Explain how the bonds of these molecules impact disassociation rate.
Answer:
57) Describe how the properties of phospholipids make these molecules well suited for plasma membranes.
Answer:
58) A scientist claims that when a protein is denatured, it can be expected that its secondary structure will more
likely be retained when compared to all other levels of protein structure structures. Do you agree? Explain.
Answer:
15
Figure 2.5
59) Use Figure 2.5 to answer the following. Starch, cellulose, dextran, and glycogen are polysaccharides. How are
they similar? To what are their different properties due? Why can’t an enzyme that hydrolyzes starch degrade
cellulose?
Answer:
60) Compare a molecule of a nucleotide to ATP. Could a cell simply insert ATP into DNA without altering it?
Explain.
Answer:
16
Answer Key
Testname: C2
1) D
2) A
3) B
4) C
5) C
6) C
7) C
8) E
9) B
10) B
11) D
12) C
13) B
14) C
15) C
16) C
17) A
18) D
19) D
20) D
21) C
22) A
23) A
24) C
25) C
26) C
27) B
28) B
29) C
30) B
31) B
32) A
33) E
34) D
35) C
36) C
37) C
38) B
39) E
40) A
41) E
42) C
43) C
44) B
45) B
46) FALSE
47) TRUE
48) FALSE
49) FALSE
50) TRUE
17
Answer Key
Testname: C2
51) FALSE
52) TRUE
53) FALSE
54) TRUE
55) FALSE
56)
57)
58)
59)
60)
18
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