CAMPBELL BIOLOGY PG 60-200

27) 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 28) Which of the pairs of molecular structures shown depict enantiomers (enantiomeric forms) of the same molecule? A) B) C) D) Answer: C Bloom's Taxonomy: Synthesis/Evaluation Section: 4.2 29) Use the figure to answer the question. Thalidomide and L-dopa (see figure) 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 30) 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) C2H5COOH is not polar, but C3H7OH is polar. Answer: A Bloom's Taxonomy: Application/Analysis Section: 4.3 31) Which of the functional groups is not reactive but serves as a recognizable tag on the DNA molecule and alter the expression of genes in the cells. A) amino B) methyl C) carboxyl D) hydroxyl Answer: B Bloom's Taxonomy: Application/Analysis Section: 4.3 32) 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 33) 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: Application/Analysis Section: 4.3 34) Amino acids are acids because they always possess as the functional group? A) amino B) carbonyl C) carboxyl D) phosphate Answer: C Bloom's Taxonomy: Application/Analysis Section: 4.3 35) 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 What is the name of the functional group shown in the figure? A) carbonyl B) ketone C) aldehyde D) carboxyl Answer: D Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 37) Use the figures to answer the question. Which functional group shown can pick up protons and raise the pH of the surrounding solution? A) A B) B C) C D) D Answer: C Bloom's Taxonomy: Knowledge/Comprehension Section: 4.3 38) Use the figures to answer the question. Which of the functional groups shown helps stabilize proteins by forming covalent cross-links within or between protein molecules? A) A