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Unformatted text preview: IEA Biochemistry Mock Midterm Spring 2003 1. Which of the following statements concerning chemical reactions in the human body is incorrect? A. Due to the non-specific nature of enzymes, many reactions are able to be carried out in the human body that would otherwise proceed very slowly or not at all in nature. B. Cellular compartmentalization helps dictate which reactions may occur. C. The energetics of chemical reactions obey the laws of thermodynamics. D. All the above are true. 2. Which of the following statements is false? A. Catabolism is the process by which large biochemical molecules are broken down by cells to harness the released free energy. B. Most biochemical reactions require enzymes in order to carry out reactions that would otherwise be thermodynamically unfavorable. C. Lipids are one of 4 major compounds involved in biochemical reactions D. All of the above are true. 3. A solution has a pH of 4. What is the hydroxide concentration at this pH? A. 10 10 B. 10-10 C 10 4 D.10-4 4. Which of the following statements is false? A. Weak acids do not undergo complete dissociation when dissolved in water. B. Weak acids can either be organic or inorganic compounds. C. At its pKA value weak acids are 50% dissociated. D. Altering the pH of a solution from 5 to 10 involves a doubling of its hydrogen concentration. 5. All the following characterize water as a solvent except? A. Water is a good solvent for salts but not effective for other polar molecules like D-glucose. B. Hydrogen bonds between -OH/-OH interactions are very important in determining the conformations of proteins and nucleic acid molecules. C. Waters polar nature allows it to actually break certain electrostatic bonds. D. Two or more of the above are incorrect. 6. Which of the following values represents the change in hydrogen ion concentration when the pH of a solution is reduced from 6 to 4? A. Decrease by 2 B. Decrease by 100 C. Increase by 200 D. Increase by 100 7. Which of the following statements about acids is false? A. A good buffering system against acidic insult will have a higher concentration of conjugate base than acid. B. A weak base in association with its conjugate acid acts as a good buffer only within about on pH unit on either side of its pKA value. C. At its pKA value a weak acid is 50% dissociated. D. All the above are true Statements. 8. Which of the following statements is false? A. There are 20 amino acids that are actually put into the protein during synthesis. B. In humans there are more than 20 amino acids found in proteins. C. All amino acids except for glutamate can exist as mirror images. D. L or D does not denote the direction in which the plane of polarized light is rotated....
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This note was uploaded on 04/03/2012 for the course BI, HEALTH 251 taught by Professor N/a during the Spring '12 term at MD University College.
- Spring '12