Exam_II-01_key - BCH 401-General Biochemistry Midterm 2...

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BCH 401-General Biochemistry Midterm 2 March 16, 2001 100 points; 25 questions - Each question has a value of 4 points Kuo Section: questions 1-5 1. Which of the following statements regarding monosaccharides is FALSE? a. Like amino acids, most sugars exist as D- or L-configuration. However, the D-configuration of sugars predominates in nature. b. Ribulose is a ketopentose. c. Glucose is an aldohexose. d. In aqueous solutions, the predominant form of glucose is a pyranose where C6 and C1 are covalently bonded to form a six-membered ring. 2. Which of the following statements regarding sugars is FALSE? a. Both starch and glycogen have the backbone of alpha (1,4) linkage of glucose molecules. b. The difference between amylose and cellulose is how frequently they branch. c. Chitin is the main structural polysaccharide found in the exoskeleton of insects. d. Maltose, lactose, and sucrose are all disaccharides. 3. Which of the following statements regarding lipids is FALSE? a. Most naturally occurring unsaturated fatty acids are in cis-configuration resulting in a kink structure in the tails. b. Triacylglycerols, a.k.a. triglycerides, are the backbone for many biologically important lipids, such as phosphatidylcholine, sphingolipids, and cholesterol. c. Some sphingolipids, such as sphingomyelin and ganglioside, perform important neurological functions. d. Steroid hormones serve many functions including salt balance, metabolic and sexual functions. 4. Which of the following statements regarding biological membranes is CORRECT? a. Because membrane constituents, including proteins and lipids, can diffuse laterally and transversely, biological membranes are symmetrical in their composition. b. Peripheral membrane proteins frequently contain one or more transmembrane domains. c. Passive diffusion of small molecules across the membrane follows a simple thermodynamic mode. d. Facilitated diffusion requires a protein transporter and energy consumption. 5. Which of the following statements regarding active transport across biological membranes is FALSE? a. Active transport uses energy, such as ATP breakdown and sunlight, to drive the movement of molecules against the thermodynamic potential. b. Active transport may be coupled to secondary transport systems. c. The sodium pump, a.k.a. Na
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Exam_II-01_key - BCH 401-General Biochemistry Midterm 2...

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