ch02 - Chapter 2: The Molecular Composition of Plant Cells...

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Chapter 2: The Molecular Composition of Plant Cells Multiple-Choice Questions 1. Introduction; p. 15; easy; ans: e Which substance makes up more than half of all living matter and more than 90 percent of the weight of most plant tissues? a. Protein b. Cellulose c. Starch d. Triglyceride e. Water 2. Introduction; p. 15; easy; ans: c By definition, an organic molecule contains: a. hydrogen. b. oxygen. c. carbon. d. calcium. e. double bonds. 3. Organic Molecules; pp. 15–16; moderate; ans: d Nucleic acids are different from proteins in that nucleic acids contain: a. carbon. b. hydrogen. c. nitrogen. d. phosphorus. e. sulfur. 4. Carbohydrates; p. 16; easy; ans: b The most abundant organic molecules in nature are: a. proteins. b. carbohydrates. c. lipids. d. nucleic acids. e. water molecules. 5. Carbohydrates; p. 16; easy; ans: c _________ is a monosaccharide, and ______________ is a disaccharide. a. Cellulose; lactose b. Sucrose; glucose c. Fructose; maltose d. Glucose; ribose e. Lactose; sucrose
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2 Chapter 2 The Molecular Composition of Plant Cells 6. Carbohydrates; p. 16; easy; ans: d Which of the following is characterized by the formula (CH 2 O) n ? a. Steroids b. Amino acids c. Fatty acids d. Monosaccharides e. Alkaloids 7. Carbohydrates; p. 17; moderate; ans: d The primary source of chemical energy in plants and animals is: a. sucrose. b. starch. c. fructose. d. glucose. e. ribose. 8. Carbohydrates; p. 17; moderate; ans: b The common transport form of sugar in animals is ______ and in plants is ______. a. sucrose; glucose b. glucose; sucrose c. starch; sucrose d. maltose; lactose e. fructose; maltose 9. Carbohydrates; p. 17; moderate; ans: e The formation of ______ from ______ occurs by dehydration synthesis. a. glucose and fructose; sucrose b. glucose; starch c. monomers; polymers d. glucose; cellulose e. sucrose; glucose and fructose 10. Carbohydrates; p. 17; moderate; ans: b Which of the following statements about hydrolysis reactions is FALSE? a. They are energy-yielding reactions. b. They are a type of condensation reaction. c. They involve the addition of a molecule of water. d. An example is the conversion of a polymer to its monomers. e. An example is the conversion of disaccharides to monosaccharides.
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Chapter 2 The Molecular Composition of Plant Cells 3 11. Carbohydrates; p. 17; moderate; ans: a Starch is a ______ composed of ______ subunits. a. polysaccharide; glucose b. disaccharide; glucose and fructose c. monosaccharide; fructan d. polysaccharide; cellulose e. disaccharide; sucrose 12. Carbohydrates; p. 17; easy; ans: b Which molecules are found in the starch grains of plant cells? a. Fructans b. Amylose and amylopectin c. Glycogen and sucrose d. Oligosaccharins and chitin e. Cellulose and maltose 13. Carbohydrates; p. 17; moderate; ans: e In wheat, rye, and barley, the principal storage polysaccharide of leaves and stems is: a. amylose. b.
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ch02 - Chapter 2: The Molecular Composition of Plant Cells...

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