Campbell Biology, 10e (Reece) Chapter 4 Carbon and the Molecular Diversity of Life 1) The element present in all organic molecules is _____. A) hydrogen B) oxygen C) carbon D) nitrogen Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.1 2) The complexity and variety of organic molecules is due to _____. A) the chemical versatility of carbon atoms B) the variety of rare elements in organic molecules C) the diverse bonding patterns of nitrogen D) their interaction with water Answer: A Bloom's Taxonomy: Knowledge/Comprehension Section: 4.1 3) 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 be synthesized only 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) living organisms are composed of the same elements present in nonliving things, plus a few special trace elements found only in living organisms or their products D) living organisms can be understood in terms of the same physical and chemical laws that can be used to explain all natural phenomena Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.1 4) Differences among organisms are caused by differences in the _____. A) elemental composition from organism to organism B) types and relative amounts of organic molecules synthesized by each organism C) sizes of the organic molecules in each organism D) types of inorganic compounds present in each organism Answer: B Bloom's Taxonomy: Application/Analysis Section: 4.1 1 Copyright © 2014 Pearson Education, Inc. 5) Stanley Miller's 1953 experiments supported the hypothesis that _____. A) life on Earth arose from simple inorganic molecules B) organic molecules can be synthesized abiotically under conditions that may have existed on early Earth C) life on Earth arose from simple organic molecules, with energy from lightning and volcanoes D) the conditions on early Earth were conducive to the origin of life Answer: B Bloom's Taxonomy: Synthesis/Evaluation Section: 4.1 6) When Stanley Miller applied heat and electrical sparks to a mixture of simple inorganic compounds such as methane, hydrogen gas, ammonia, and water vapor, what compounds were produced? A) only simple organic compounds such as formaldehyde and cyanide B) mostly hydrocarbons C) only simple inorganic compounds D) simple organic compounds, amino acids, and hydrocarbons Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.1 7) Which of the following is true of carbon? A) It forms only polar molecules. B) It can form a maximum of three covalent bonds with other elements. C) It is highly electronegative. D) It can form both polar and nonpolar bonds. Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 8) Why is carbon so important in biology? A) It is a common element on Earth. B) It has very little electronegativity, making it a good electron donor. C) It bonds to only a few other elements. D) It can form a variety of carbon skeletons and host functional groups. Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 9) How many electron pairs does carbon share to complete its valence shell? A) 2 B) 3 C) 4 D) 8 Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 2 Copyright © 2014 Pearson Education, Inc. 10) A carbon atom is most likely to form what kind of bond(s) with other atoms? A) ionic B) hydrogen C) covalent D) ionic bonds, covalent bonds, and hydrogen bonds Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 11) Why are hydrocarbons insoluble 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 exhibit considerable molecular complexity and diversity. D) They are less dense than water. Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 12) Which of the following statements correctly describes cis-trans 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. Answer: A Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 13) Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that _____. A) have identical chemical formulas but differ in the branching of their carbon skeletons B) are mirror images of each other C) differ in the location of their double bonds D) differ in the arrangement of atoms around their double bonds Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 14) What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration? A) the presence or absence of bonds with oxygen atoms B) the presence or absence of double bonds between the carbon atom and other atoms C) the polarity of the covalent bonds between carbon and other atoms D) the solvent in which the organic molecule is dissolved Answer: B Bloom's Taxonomy: Application/Analysis Section: 4.2 3 Copyright © 2014 Pearson Education, Inc. 15) Compared to a hydrocarbon chain where all the carbon atoms are linked by single bonds, a hydrocarbon chain with the same number of carbon atoms, but with one or more double bonds, will _____. A) be more flexible in structure B) be more constrained in structure C) be more polar D) have more hydrogen atoms Answer: B Bloom's Taxonomy: Application/Analysis Section: 4.2 16) Organic molecules with only hydrogens and five carbon atoms cannot _____. A) have a branching carbon skeleton B) have different combinations of double bonds between carbon atoms C) have different positions of double bonds between carbon atoms D) form enantiomers Answer: D Bloom's Taxonomy: Application/Analysis Section: 4.2 17) The two molecules shown in the figure below are best described as _____. A) enantiomers B) structural isomers C) cis-trans isomers D) chain length isomers Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 4 Copyright © 2014 Pearson Education, Inc. 18) The figure above shows the structures of glucose and fructose. 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 Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 19) The figure above shows the structures of glucose and fructose. These two molecules are _____. A) isotopes B) enantiomers C) cis-trans isomers D) structural isomers Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 20) The two molecules shown in the figure below are best described as _____. A) enantiomers B) radioactive isotopes C) structural isomers D) cis-trans isomers Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 5 Copyright © 2014 Pearson Education, Inc. 21) Which of the following illustrations is NOT a structural isomer of an organic compound with the molecular formula C6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted. A) B) C) D) Answer: C Bloom's Taxonomy: Application/Analysis Section: 4.2 6 Copyright © 2014 Pearson Education, Inc. 22) Which of the pairs of molecular structures shown below depict enantiomers (enantiomeric forms) of the same molecule? A) B) C) D) Answer: C Bloom's Taxonomy: Synthesis/Evaluation Section: 4.2 7 Copyright © 2014 Pearson Education, Inc. 23) Which of the pairs of molecular structures shown below do NOT depict enantiomers (enantiomeric forms) of the same molecule? A) B) C) D) Answer: B Bloom's Taxonomy: Synthesis/Evaluation Section: 4.2 8 Copyright © 2014 Pearson Education, Inc. 24) Thalidomide and L-dopa, shown below, are examples of pharmaceutical drugs that occur as enantiomers, or molecules that _____. A) have identical three-dimensional shapes B) are mirror images of one another C) are mirror images of one another and have the same biological activity D) are cis-trans isomers Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.2 25) Which of the following molecules is polar? C3H7OH C2H5COOH A) C3H7OH and C2H5COOH are both polar molecules. B) Neither C2H5COOH or C3H7OH is polar. C) C2H5COOH is polar, but C3H7OH is not polar. D) C3H7OH is not polar, but C3H7OH is polar. Answer: A Bloom's Taxonomy: Application/Analysis Section: 4.3 26) Which of the functional groups below acts most like an acid in water? A) amino B) carbonyl C) carboxyl D) hydroxyl Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 27) A compound contains hydroxyl groups as its predominant functional group. Therefore, this compound _____. A) lacks an asymmetric carbon and is probably a fat or lipid B) should dissolve in water C) should dissolve in a nonpolar solvent D) will not form hydrogen bonds with water Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 9 Copyright © 2014 Pearson Education, Inc. 28) Which two functional groups are always found in amino acids? A) carbonyl and amino groups B) carboxyl and amino groups C) amino and sulfhydryl groups D) hydroxyl and carboxyl groups Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 29) Amino acids are acids because they always possess which functional group? A) amino B) carbonyl C) carboxyl D) phosphate Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 30) A hydrocarbon skeleton is covalently bonded to an amino group at one end and a carboxyl group at the other end. When placed in water this molecule would function _____. A) only as an acid because of the carboxyl group B) only as a base because of the amino group C) as an acid and a base D) as neither an acid nor a base Answer: C Bloom's Taxonomy: Application/Analysis Section: 4.3 31) Which chemical group can act as an acid? A) amino B) carbonyl C) carboxyl D) methyl Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 32) Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? Testosterone and estradiol _____. A) are structural isomers but have the same molecular formula B) are cis-trans isomers but have the same molecular formula C) have different functional groups attached to the same carbon skeleton D) are enantiomers of the same organic molecule Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 10 Copyright © 2014 Pearson Education, Inc. 33) What is the name of the functional group shown in the figure below? A) carbonyl B) ketone C) aldehyde D) carboxyl Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 34) Which of the structures illustrated above is an impossible covalently bonded molecule? A) A B) B C) C D) D Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 35) In which of the structures illustrated above are the atoms bonded by ionic bonds? A) A B) B C) C D) none of the structures Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 11 Copyright © 2014 Pearson Education, Inc. 36) Which functional group shown above is characteristic of alcohols? A) A B) B C) C D) D Answer: A Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 37) 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) B and C Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 38) Which of the groups shown above is a functional group that helps stabilize proteins by forming covalent cross-links within or between protein molecules? A) A B) B C) C D) D Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 39) Which of the groups above is a carboxyl functional group? A) A B) B C) C D) D Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 12 Copyright © 2014 Pearson Education, Inc. 40) Which of the groups above is an acidic functional group that can dissociate and release H+ into a solution? A) A B) B C) C D) D Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 41) Which of the groups above is a basic functional group that can accept H+ and become positively charged? A) A B) B C) C D) D Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 42) Which molecule shown above would have a positive charge in a cell? A) A B) B C) C D) D Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 43) Which molecule(s) shown above is (are) ionized in a cell? A) A B) B and D C) C and D D) D Answer: C Bloom's Taxonomy: Application/Analysis Section: 4.3 13 Copyright © 2014 Pearson Education, Inc. 44) Which molecules shown above contain a carbonyl group? A) A and B B) B and C C) B, C, and D D) C and D Answer: A Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 45) Which molecule shown above has a carbonyl functional group in the form of a ketone? A) A B) B C) C D) D Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 46) Which molecule shown above has a carbonyl functional group in the form of an aldehyde? A) A B) B C) C D) D Answer: A Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 47) Which molecule shown above contains a carboxyl group? A) A B) B C) C D) D Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 48) Which molecule shown above can increase the concentration of hydrogen ions in a solution and is, therefore, an organic acid? A) A B) B C) C D) D Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 14 Copyright © 2014 Pearson Education, Inc. 49) Which molecule shown above can form a cross linkage? A) A B) B C) C D) D Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 50) Which molecule shown above contains an amino functional group, but is NOT an amino acid? A) A B) B C) C D) D Answer: A Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 51) Which molecule shown above is a thiol? A) A B) B C) C D) D Answer: B Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 52) Which molecule shown above contains a functional group that cells use to transfer energy between organic molecules? A) A B) B C) C D) D Answer: D Bloom's Taxonomy: Application/Analysis Section: 4.3 15 Copyright © 2014 Pearson Education, Inc. 53) Which molecule shown above can function as a base? A) A B) B C) C D) D Answer: A Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 54) Which of the following is a FALSE statement concerning amino groups? Amino groups _____. A) are basic with respect to pH B) are found in amino acids C) contain nitrogen D) are nonpolar Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 16 Copyright © 2014 Pearson Education, Inc.
