Download Biology, 7e (Campbell)

Biology, 7e (Campbell)
Chapter 4: Carbon and the Molecular Diversity of Life
Chapter Questions
1) Organic chemistry is a science based on the study of
A) functional groups.
B) vital forces interacting with matter.
C) carbon compounds.
D) water and its interaction with other kinds of molecules.
E) inorganic compounds.
2) Early 19th-century scientists believed that living organisms differed from nonliving things as a result of
possessing a "life force" that could create organic molecules from inorganic matter. The term given to this belief is
A) organic synthesis.
B) vitalism.
C) mechanism.
D) organic evolution.
E) inorganic synthesis.
3) The concept of vitalism is based on a belief in a life force outside the jurisdiction of physical and chemical laws.
According to this belief, organic compounds can arise only within living organisms. Which of the following did the
most to refute the concept of vitalism?
A) Wöhler's synthesis of urea
B) Berzelius's distinction between organic and inorganic compounds
C) Miller's experiments with ancient atmospheres
D) Rodriguez's studies of phytochemicals
E) Kolbe's synthesis of acetic acid
4) The experimental approach taken in current biological investigations presumes that
A) simple organic compounds can be synthesized in the laboratory from inorganic precursors, but complex organic
compounds like carbohydrates and proteins can only be synthesized by living organisms.
B) a life force ultimately controls the activities of living organisms and this life force cannot be studied by physical
or chemical methods.
C) although a life force, or vitalism, exists in living organisms, this life force cannot be studied by physical or
chemical methods.
D) living organisms are composed of the same elements present in nonliving things, plus a few special trace
elements found in only living organisms or their products.
E) living organisms can be understood in terms of the same physical and chemical laws that can be used to explain
all natural phenomena.
5) Which property of the carbon atom gives it compatibility with a greater number of different elements than any
other type of atom?
A) Carbon has 6 to 8 neutrons.
B) Carbon has a valence of 4.
C) Carbon forms ionic bonds.
D) A and C only
E) A, B, and C
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6) How many electron pairs does carbon share in order to complete its valence shell?
A) 1
B) 2
C) 3
D) 4
E) 8
7) What type(s) of bond(s) does carbon have a tendency to form?
A) ionic
B) hydrogen
C) covalent
D) A and B only
E) A, B, and C
8) Which of the following is (are) true about the carbon atoms present in all organic molecules?
A) They were incorporated into organic molecules by plants.
B) They were processed into sugars through photosynthesis.
C) They are ultimately derived from carbon dioxide.
D) Only A and C are correct.
E) A, B, and C are correct.
9) What is the reason why hydrocarbons are not soluble in water?
A) The majority of their bonds are polar covalent carbon to hydrogen linkages.
B) The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages.
C) They are hydrophilic.
D) They exhibit considerable molecular complexity and diversity.
E) They are lighter than water.
10) How many structural isomers are possible for a substance having the molecular formula C4H10?
A) 1
B) 2
C) 4
D) 3
E) 11
Figure 4.1
11) The two molecules shown in Figure 4.1 are best described as
A) optical isomers.
B) radioactive isotopes.
C) structural isomers.
D) nonradioactive isotopes.
E) geometric isomers.
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Figure 4.2
12) Observe the structures of glucose and fructose in Figure 4.2. These two molecules differ in the
A) number of carbon, hydrogen, and oxygen atoms.
B) types of carbon, hydrogen, and oxygen atoms.
C) arrangement of carbon, hydrogen, and oxygen atoms.
D) number of oxygen atoms joined to carbon atoms by double covalent bonds.
E) answers A, B, and C
13) Observe the structures of glucose and fructose in Figure 4.2. These two molecules are
A) geometric isotopes.
B) enantiomers.
C) geometric isomers.
D) structural isomers.
E) nonisotopic isomers.
14) Which of the following is true of geometric isomers?
A) They have variations in arrangement around a double bond.
B) They have an asymmetric carbon that makes them mirror images.
C) They have the same chemical properties.
D) They have different molecular formulas.
E) Their atoms and bonds are arranged in different sequences.
Figure 4.3
15) The two molecules shown in Figure 4.3 are best described as
A) enantiomers.
B) radioactive isotopes.
C) structural isomers.
D) nonisotopic isomers.
E) geometric isomers.
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16) Research suggests that side effects from Ritalin, the drug used to treat attention deficit disorder, may be caused
by contamination of enantiomers, or molecules that
A) have identical three-dimensional shapes.
B) are mirror images of one another.
C) lack an asymmetric carbon.
D) differ in the location of their double bonds.
E) differ in their electrical charge.
17) A compound contains hydroxyl groups as its predominant functional group. Which of the following statements
is true concerning this compound?
A) It lacks an asymmetric carbon, and it is probably a fat or lipid.
B) It should dissolve in water.
C) It should dissolve in a nonpolar solvent.
D) It won't form hydrogen bonds with water.
E) It is hydrophobic.
18) Which is the best description of a carbonyl group?
A) an oxygen joined to a carbon by a single covalent bond
B) a nitrogen and two hydrogens joined to a carbon by covalent bonds
C) a carbon joined to two hydrogens by single covalent bonds
D) a sulfur and a hydrogen joined to a carbon by covalent bonds
E) a carbon atom joined to an oxygen by a double covalent bond
Figure 4.4
19) What is the name of the functional group shown in Figure 4.4?
A) carbonyl
B) ketone
C) aldehyde
D) carboxyl
E) hydroxyl
20) Which of the following contains nitrogen in addition to carbon, oxygen, and hydrogen?
A) an alcohol such as ethanol
B) a monosaccharide such as glucose
C) a steroid such as testosterone
D) an amino acid such as glycine
E) a hydrocarbon such as benzene
21) Which of the following is a false statement concerning amino groups?
A) They are basic in pH.
B) They are found in amino acids.
C) They contain nitrogen.
D) They are nonpolar.
E) They are components of urea.
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22) Which two functional groups are always found in amino acids?
A) ketone and aldehyde
B) carbonyl and carboxyl
C) carboxyl and amino
D) phosphate and sulfhydryl
E) hydroxyl and aldehyde
23) Amino acids are acids because they always possess which functional group?
A) amino
B) carbonyl
C) carboxyl
D) sulfhydryl
E) aldehyde
24) A carbon skeleton is covalently bonded to both an amino group and a carboxyl group. When placed in water it
A) would function only as an acid because of the carboxyl group.
B) would function only as a base because of the amino group.
C) would function as neither an acid nor a base.
D) would function as both an acid and a base.
E) is impossible to determine how it would function.
25) A chemist wishes to make an organic molecule less acidic. Which of the following functional groups should be
added to the molecule in order to do so?
A) carboxyl
B) sulfhydryl
C) hydroxyl
D) amino
E) phosphate
26) Which functional groups can act as acids?
A) amine and sulfhydryl
B) carbonyl and carboxyl
C) carboxyl and phosphate
D) hydroxyl and aldehyde
E) ketone and amino
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The following questions refer to the structures shown in Figure 4.5.
Figure 4.5
27) Which of the structures is an impossible covalently bonded molecule?
28) Which of the structures contain(s) a carboxyl functional group?
A) A
B) B
C) C
D) C and E
E) none of the structures
29) In which of the structures are the atoms bonded by ionic bonds?
A) A
B) B
C) C
D) C, D, and E only
E) none of the structures
The following questions refer to the functional groups shown in Figure 4.6.
Figure 4.6
30) Which is a hydroxyl functional group?
31) Which is an amino functional group?
32) Which is a carbonyl functional group?
33) Which is a functional group that helps stabilize proteins by forming covalent cross-links within or between
protein molecules?
34) Which is a carboxyl functional group?
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35) Which is an acidic functional group that can dissociate and release H+ into a solution?
36) Which is a basic functional group that can accept H+ and become positively charged?
The following questions refer to the molecules shown in Figure 4.7.
Figure 4.7
37) Which molecule is water-soluble because it has a hydroxyl functional group?
38) Which molecule is an alcohol?
39) Which molecules contain a carbonyl group?
A) A and B
B) B and C
C) C and D
D) D and E
E) E and A
40) Which molecule has a carbonyl functional group in the form of a ketone?
41) Which molecule has a carbonyl functional group in the form of an aldehyde?
42) Which molecule contains a carboxyl group?
43) Which molecule can increase the concentration of hydrogen ions in a solution and is therefore an organic acid?
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The following questions refer to the molecules shown in Figure 4.8.
Figure 4.8
44) Which molecule contains a sulfhydryl functional group?
45) Which molecule functions to transfer energy between organic molecules?
46) Which molecule contains an amino functional group, but is not an amino acid?
47) Which molecule is a thiol?
48) Which molecule is an organic phosphate?
49) Which molecule can function as a base?
50) Which of the following statements is (are) true about the phosphate ion?
A) It is negatively charged.
B) It has acid properties.
C) It is hydrophobic.
D) Only A and B are true.
E) A, B, and C are true.
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